Baseline (Widescreen) Solution & Issues
This one's particularly bad for widescreen. The 4:3 FOV is low enough, and not only does enabling widescreen lower it even further, but part of the minimap gets cut off. Note that this is NOT Day of Defeat: Source.
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Eyefinity / Surround Specific Solution & Issues
4k UHD Specific Solution & Issues