LGR recently did a retrospective on the game, worth watching.
One thing missing from this is the way one could customise the settings even more to add further detail. I've upped the shadow detail and distance so that even a GTX 980 only gives about 45fps (I hate LOD effects in games). Another thing missing is the fact that, back in those days, SLI/CF were very effective and better supported; I used two GTX 580 3GB cards to run the game nicely, with settings designed not to exceed the available VRAM at 1920x1200. Two 7970s was very potent, but oh dear grud the noise level.
Also, the way Crysis Warhead improved performance shows that the initial Crysis engine was not that well optimised. Crysis 2 looks nicer but is a much narrower environment (urban areas can look cool but there's less complexity in a typical scene). Crysis 3 is even worse; think you can get to that cool looking place over yonder? Nope.
I tried to use the Crysis bench program to test GPUs but I was getting inconsistent results so I gave up.
Ian.
PS. The forum posting is broken again.