Pentax as a replacement for my Oly 4/3 gear - opinions?

BigBen08 wrote:

The major reason for buying my Olympus E-620, 12-60, and 50-200 was the small body and lens size, in addition to the excellent lens quality. I've enjoyed this system very much, but it's time to upgrade the body. Of course there is the E-5, but it's much larger than the E-620 and very expensive. So now it's time to explore other options.

I'm attracted to the K-5 II for its excellent IQ and features. And it's only a hair or two larger than my E-620 (a small size dslr is important to me). I'm thinking the DA* 16-50 f2.8 and DA* 50-135 f2.8 might make a great combo. Compared to my Oly lenses, I'd give up some reach. But the 50-135 is smaller and lighter than my Oly 50-200, which is a benefit.

I intend to use this Pentax system as a general walk-about, event photography, museums, parades, and cityscapes (at night).

I have no experience with Pentax. Has anyone moved from Olympus 4/3 to Pentax?