Peterm, there should be no reason why landscape shots in particular should be soft with the K7 (or any camera) unless you have:
(a) camera movement,
(b) a soft lens,
(c) a crappy filter on the lens,
(d) a dirty lens or sensor,
(e) are shooting through haze or other atmospheric pollution,
(f) not focussed properly.
Eliminate all the above and you should be right
As a 14MP camera the K7 is capable of capturing a lot of detail, at lower ISO's in particular, and I've seen plenty of pictures that confirm that, so it should be great for landscapes.