Console versions most often have the same texture quality. Look at Tomb Raider Underworlds for example:
PS3 version (originally a 1280x720 res pic that I upscaled to 1080P then cut out a portion to be able to do a comparison):
PC version:
(All settings maxed, 4+AA. Screen taken with FRAPS. Res 1920x1200, portion cut out to be able to compare with PS3-version)
As you can see the textures are exactly the same. The blurryness on the PS3 is mostly caused by the upscale from original 1280x720 res to 1920x1080 (and perhaps somewhat by higher AF on the PC version, not sure).
And this applies to most multiplatform games - the PC version has the same textures, 3D models, mapping, lighting effects etc. Only the resolution and AA/AF is better on PC - whic is not as big thing as PC elitis make it to be.
EDIT: don't be fooled by the blurryness of the first (PS3) pic. It's caused by the "not best possible" quality of the original screenshot at IGN and also the extra loss in image quality because I used MS Paint to upscale it from 720p to 1080p (it isn't a good program to convert screenshots in).
