Most used?
I could of course let lightroom count them, but it is something that change with time. When new the DA10-17, DA50-135 and DA35ltd was on my lens a lot, but still the kit zoom beat them in total number of shots, though I had it much longer. The highest count is still my A lenses, but lightroom seams to count them as one lens.
Favorite lens?
It must be the A*135/1.8. It took some time on the *istDS to figure out how to use it as a 200mm equivalent, but gradually I became comfortable with that as well. For a while I thought that the DA*50-135 would replace it, being more versatile and lighter to cary, but after testing them against each other I've learned that the DA*50-135 does not perform so well at 135mm as to rivale the A* lens. The A*85/1.4 is a fantastic lens as well, but the A*135 performs better at small aperture numbers in low light, so despite that the 85 is closer to my old film focal length favorite of 135mm, I prefere the A*135 over the A*85. Testing them against each other I've also learned that the DA*50-135 is close to its best performance at 85mm so I'm now less sorry that "my" A*85 is only on loan, and less craving the FA*85 or FA77ltd ("less" meaning they are still on my want-to-get-list, but currently surpassed by my crawing to find a favorite wide angle).