Well for some hair textures if you don't use the texture filtering they look like crap. This applies to Koz's stuff IIRC some of Maya's stuff, and even the Sassy hair 2(realistic textures) at Daz. It's pretty annoying. If I need to do an extreme closeup for my animation I may render the character in Poser 4 and composite the background from P5 if I need any P5 shaders in that shot.