I've had my eye on the K-5 for a long time and the new one makes it more interesting. Seems like the ideal body for a hiking LS shooter like myself. But lack of lenses of the sort I need has held me back. The 17-70 f/4 mentioned above seems like a great general purpose lens, but what about something longer (that's light, smallish and excellent IQ)? I've always shot Canon and like the lenses. I've had the 17-40, 17-55 f2.8, 24-105, 15-85 IS and the 70-200 f/4. That last one's the rub - it's totally unique to Canon as far as I can tell. Everybody makes great 70-200 f/2.8s, and everybody makes okay inexpensive 70-300 4-5.6s. But the 2.8s are big and heavy, and the 70-300s are, well, only okay. So I've stayed with Canon largely for the 70-200 f/4. Now Canon has a FF (6D) that's about the same weight & size as the K-5. If the new sensor continues in the vein Canon's been working the last few years, it will likely be disappointing compared to other FFs, but will still be better than most any crop. And performance-wise it doesn't match the K-5 in specs. $2100 for a mediocre FF or $1300 for an excellent crop-frame? I'll probably just keep shooting my 550d with my nice lenses and wait............