Not so far, other than with Nokia Drive, which has now moved out of exclusivity. The apps and games that are exclusives now are largely not of sufficient standard to warrant any jealousy, although it does make me wonder why HTC are not doing anything, even releasing their existing apps for Windows phone 8.
The Lumias themselves are enough to put me off them. The 920 is the worst Windows Phone 8 device there is. The phone is too big and too heavy and the device is so unstable compared to the 8X. We've got three at work and the Mrs has one at home and they freeze all the time, even with the latest updates. I've, touch wood, never had the 8X freeze on me.
I just hope HTC continue to support Windows phone as I can't see myself buying a Nokia unless they improve a lot.