100% of my 970's VRAM, check (max settings). 100% usage, check. high 30's-high 50's FPS in those settings, but I think it looks great. I do get the occasional stutter when panning around a large area quickly (I'm sure you've heard about the 3.5 GB/.5 GB difference in VRAM in the 970), but it really doesn't do it nearly often enough to bother me.
CPU usage, nope. 50-70% (may be held back by the 970 here). RAM usage, nowhere near that much (50%-ish of 16 GB, and I don't bother to close other things in the background like several Chrome tabs). Wonder what's going on there.
Well i use 10-15GB of RAm on average on Tombraider and no other things are open.