fa-file-o

• Original file icon style. Note gap on the inside edge of "dog-ear" corner in original Font APEX icons

fa-file-brackets

• Missing gap in corner
• Squatter, less attractive proportions

fa-file-csv

• Missing gap in corner
• Wrong proportions
• Text in small version should be positioned higher, and the bottom edge line should continue to half the width
• Text in large version is not in a floating box like other icons showing a file extension
• Different lettering style—compare more angular "S" and "C" on original fa-file-excel-o and fa-file-word-o icons

fa-file-json

• Missing gap in corner
• Wrong proportions
• Text in small version should be positioned higher, and the bottom edge line should continue to half the width
• Text in large version is not in a floating box like other icons showing a file extension
• Different lettering style
• Text can be made narrower to fit the original icon size abd proportions by using the original angular style and a lower-case style reprensentation of the "N", with a semi-rounded top instead of a diagonal crossbar

fa-file-medical

• Missing gap in corner
• Wrong proportions

fa-file-prescription

• Missing gap in corner
• Wrong proportions
• Different lettering style

fa-file-signature

• Missing gap in corner
• Wrong proportions

fa-2d-mode

• Different lettering style—compare "D" in original fa-file-word-o icon
• Inconsistent line width on bow of "D"
• Not really sure what the use case for this is in an APEX context, but if it has one I would prefer to see a pictorial rather than textual representation

fa-3d-mode

• Different lettering style
• Inconsistent line width on bow of "D"
• Not really sure what the use case for this is in an APEX context, but if it has one I would prefer to see a pictorial rather than textual representation

fa-404

• Inconsistent element proportions between small and large versions (e.g. size and spacing of eyes)

fa-4k

• Inconsistent element proportions between small and large versions

fa-abacus

• Inconsistent design approach between small and large versions: large version adds more design elements at the same size rather than increasing the size of those used in the small icon (compare with fa-accessor icons below)

fa-accordion

• Don't think the meaning of this is particularly clear
• Potential use cases are also unclear, now that APEX has dropped support for jQuery UI accordions!
• Circles on large version are confusing and unnecessary

fa-alarm-check

• Alarm bells on small version look more like buttons, which gives the impression of a stopwatch rather than an alarm clock. Can't these be made to have a more rounded appearance?
• Conversely on the large version, the attachment of the alarm bells directly to the body of the clock gives the appearance of ears on a teddy bear. I would suggest they be physically separated like the small version

fa-alarm-clock

• Large version: inconsistent line width on curve of right alarm bell

fa-alarm-minus

• Large version: inconsistent line widths on curves of alarm bells

fa-alarm-plus

• Large version: inconsistent line widths on curves of alarm bells

fa-alarm-snooze

• Large version: inconsistent line widths on curves of alarm bells

fa-alarm-times

• Large version: inconsistent line widths on curves of alarm bells
• Large version looks like a koala

fa-bug-slash

• Don't think this works. Slash should not overlap any of the bug's legs

fa-file-brackets

• See previous evaluation of file icons

fa-file-csv

• See previous evaluation of file icons

fa-file-json

• See previous evaluation of file icons

fa-file-medical

• See previous evaluation of file icons

fa-file-prescription

• See previous evaluation of file icons

fa-file-signature

• See previous evaluation of file icons

fa-heat-map

• "Heat map" has too many meanings. This is actually a representation of a circular packing diagram

fa-line-map

• This (especially the small version) meant nothing to me when I first saw it, seemingly bearing more resemblance to the ideogram on the original fa-language icon than Beck's classic tube map
• Why don' the lines attach at the centre of the nodes?

fa-location-arrow-solid

• This violates the established Font APEX icon class naming convention. The -solid suffix is superfluous. The problem is that the pre-existing fa-location-arrow icon should have been called fa-location-arrow-o as it is an outline icon. In my opinion the naming convention should take precedence, with this new icon being named fa-location-arrow, and the earlier implementation being renamed fa-location-arrow-o, even if this changes the appearance of existing applications

fa-location-circle

• This violates the established Font APEX icon class naming convention. Should be fa-location-circle-o

fa-location-circle-solid

• This violates the established Font APEX icon class naming convention. Should be fa-location-circle

fa-map-marker-camera

• I don't like this. It's not at all clear what the small version (especially at the default 16px size) is supposed to represent

fa-map-marker-camera-o

• Also don't like this. Looks like the camera is melting

fa-medical-mask

• It's not obvious this is supposed to represent. It's actually quite similar to the pre-existing fa-trophy

fa-prescription

• Different lettering style

fa-prescription-sheet

• Why is this necessary? It's virtually the same as fa-file-prescription, which if implemented properly following the original file icon conventions would look far better. I would much rather have another occupational icon representing a pharmacist/scientist/professional or engineer/builder than this amateurish duplicate of another icon.
• Different lettering style

fa-radiation

• Central dot in small version is too small
• Would look better if the "rays" were represented either by concentric lines (see existing fa-feed icon) or if the segments were equal in size or smaller than the gaps between them

fa-size-l

• Are these really necessary? In what circumstances would they be used instead of plain text?

fa-size-s

• Different lettering style

fa-size-xl

• Inconsistent and poor letter spacing

fa-size-xs

• Different lettering style
• Inconsistent and poor letter spacing

fa-size-xxl

• Inconsistent and poor letter spacing

fa-user-slash

• This does not look good. A steeper angle on the slash would enable more of the base user outline to be retained. Existing -slash icons position the slash at different angles to better fit with the underlying design