What you see above is a 4K shot of the PC version of GTA IV with some mods applied. The author of this impressive work is Raphael Smith who has explained how he did it:
“I have a Steam version of GTA IV which I modded with Better City Textures, GTA IV Road Textures by Fonias, Supreme Vehicle Conversion Pack-140 vehicles, Traffic Control System V1.0B, DKTronics70 Vegetation, and a first-person mod by C06alt. Then used IcEnhancers beta 1.25 ENB for the lighting.”
Grand Theft Auto Patch by Rockstar Games!
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However, all this visual work has a big con, the system he used was only capable of running the game at 5 fps (3384×2160) but worked great at 30-50 fps (1920×1080).
Official Source: http://www.flickr.com/photos/15539352@N02/sets/72157632886023166/