Just saw this on Gamer's Nexus review of the RX 6800 XT. The showed a Control benchmark at 4K between Nvidia cards w/ DLSS vs. the 6800 XT without DLSS.
One word.... oof.
It'll be interesting to see AMD's answer to DLSS.
DLSS is in hardware so there is no performance hit. This is very much expected and a pointless exersize as everyone knows AMD doesn't have DLSS yet. Yes the 4k performance is a bit disappointing but let's wait for the 6900xt and see what that brings to 4k.