Baseline (Widescreen) Solution & Issues
HUD and menus are stretched (3D elements in menus are scaled correctly). FMV logos are stretched from 4:3 (there are no in-game videos apart from this).
All camera modes are fully Hor+ (see additional screenshots).
The on-screen racing directions get larger as the aspect ratio widens. Everything else is scaled correctly.
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
The on-screen racing directions are slightly oversized (see additional screenshots).
Eyefinity / Surround Specific Solution & Issues
The cockpit HUD is shown on the steering wheel which is centred correctly for multi-monitor. The HUD for external cameras is stretched across the display. The minimal HUD option can be set to a centred position.
The on-screen racing directions are gigantic (see additional screenshots).
4k UHD Specific Solution & Issues