K20 or K-R

I am looking at getting a K-R but have seen a couple of mint K20's. I shoot mostly landscape at base ISO,one obvious advantage of K20D is that I live on the Isle of Lewis which = rain.
Is a used K20 a better option than a used K-R ?

The K-r is faster than the K20D, but you've hit the nail on the head regarding weather resistant sealing. If you want to shoot in the rain, you've really answered your own question.

I want to thank you John for your faithfulness in responding to questions.
I wouldnt say I want to shoot in the rain but its good to have it as peace of mind. Even if I did go out in the rain I am unsure of how far one can push these weather sealed cameras.
At base ISO is there an IQ gain in the K20 over the K-R ?
I imagine the live view on the K-R is better ?

At base ISO I think all camera can produce excellent image I would say.

The Live View of the K-r is much better.

As for the rain, I just ignore it and carry on anyway. The K10D, K20D and K-5 have all performed without a glitch no matter how wet it was. The weatherproofing on the lenses has also been fine.

However, I never change lenses until everything is absolutely dry again.

Both the cameras you mention have excellent IQ and I would be happy with either on that score.

The K20D also has the advantages of dual control wheels and a real pentaprism. The K20D's IQ at base ISO (200) is excellent. It gets a bit dodgy at faster ISOs. If you're mainly taking landscapes at low ISO, perhaps using a tripod on those wet grey days, it'll do the job just fine.

K.

PS Live view on the K20D is dire. It was introduced in the 'spec race' before Pentax had got a decent implementation sorted.

K.

If you use base ISO why not consider the K-7?
I went from a K-X to K-7 and love it. top lcd panel is great for quick glancing and the extra external buttons/dials are handy too.

Although the k20d is slow compared to the k-r I would hold both and see which you prefer... the k20d is still an excellent camera and at current second hand prices is a bargain...

I got rid of my k-r as it was to small foe my hands. Super camera though...