DLSS Image Sampling Calibration
The 4K mode looked like a soft-light filter. I tried Balanced DLSS, but it got worse. I used GamePP DLSS/FSR Image Sampling Calibrator to increase sharpening from 50 to 75. I set render resolution to 100%. RivaTuner showed effective pixel density increasing. GPU temperature stayed at 56-62C per HWiNFO. The faces are now sharp and clear, restoring the visual quality.
