DB;
The 135 SAS only is way better than the 105. The 135T2 AP is 3 axis only, but in 2 500 hours on them I still reckon one of the best AP's I've ever worked with.
When you get to the T2+ it gets better still as the climb/decsent rate on selecting an altitude is 500' fpm rather than 1000' fpm. A T2 will get mighty close to VNE quite quickly if you don't reign in the descent rate when selecting an altitude to descend to.
I'm not sure how many T2's were built SAS only, but I doubt its' many as the weight penalty of the full system actually isn't that serious, and certainly it makes the ride far more comfortable for the passengers.
If you want more info pm me.
SND