Ok, I ripped the same cd with q2 and q1 . Q1 ripps are 1- 3 bytes larger. Yes, that little. Since I am not in a hurry when I encode cds, than I decided to use q1assuming that it may not be much better, but it is not going to be worst for sure.
I'll make a listening test and decide if there is some sort of audible difference, anyway.