Yeah, I used mine a lot, my most used lens by far. But I felt like trying something different. The 135mm cost a bit more so I figured I could sell the 135 for the price I paid and then buy an AF-S 80-200 if I did not like the 135. I really like using primes more though and think I am going to stick with them. Besides the Tokina 11-16 I am getting soon I have a 50, 85, and 135. I really might try and save for one of the big gun primes like a 300 or 400 2.8.
The 105 is supposed to be just as good if not better from what I've read. A few people have said they think it's a tad sharper. I just thought it'd be too close to an 85 for now.