Well, the K-r is not weather-sealed and only has one wheel, so it sounds like you do need the K-5.
The K-r's viewfinder isn't physically smaller, but it does cover a smaller percentage of the image area, and has a smaller magnification.
You can compare your current camera with the other two here:
Pentax K-5, Pentax K-r & Pentax K10D - Pentax Camera Comparison - PentaxForums.com
There are also links to the full tech specs for both cameras on the page above.
Adam
PentaxForums.com Webmaster (
Site Usage Guide |
Site Help |
My Photography)
PentaxForums.com server and development costs are user-supported. You can help cover these costs by
donating or purchasing one of our
Pentax eBooks. Or, buy your photo gear from our affiliates,
Adorama,
B&H Photo,
KEH, or
Topaz Labs, and get
FREE Marketplace access - click here to see how! Trusted Pentax retailers: