Just install 1.6.1 ;) and also you can try all image filters with values from 1 ~ 3.
If you want sharper details in textures and objects which are in far distance, you need to increase total number of passes. e.g. if you increase passes from 100 - 400 it also increase render time...so you need to decrease 4times GI vs. AA balance. You will get approximately same RT, same GI quality, but better AA.