those aren't the easiest to capture on screenshots, but to clarify the point, a few shots from the opening of opposing force (same thing happens in vanilla), of some fairly light cases:

the shots are from a voodoo5 in d3d, latest stock 98se drivers, but this occurs on a wide variety of video hardware (3dfx v3/v5, nvidia, kyro) in both d3d and ogl, only the software renderer seems to improve things at all. i only have the blue "generation" box as the earliest versions to test, but it's the same between those versions and the last patch.

it's hard to find any info on this but i seemed to remember that running -32bpp would fix this due to presumably improved z-buffer precision but that is not the case, some console commands i tried didn't help either. there's z-fighting issues on decals that are fixable by playing with gl_polyoffset of course but that doesn't affect it otherwise. i did watch a bit of voodoo2 footage where i had trouble spotting these issues though and cannot seem to remember them at all from the steam version...