The first shot is still angle dependant it's not just the angled wall that is sharper it is everything. Although textures that sharp look nice standing still, in game and moving that would probably shimmer like hell. I've used the 81.84 drivers and they produce sharper textures than the 78.XX drivers, however, I find the HQ mode in the 8X.XX drivers requires the LOD clamp to reduce shimmering and even then it still shimmers a little. In static screenshots the Quality mode will usually look sharper than High Quality, however, less filtering does not equal better image quality.