You might want to work on your lense collection, a crappy lense on any body only gives you crappy images but a good lense on a decent body will give you good to great images. That said the focusing on Pentax vs the others isn't comparable, they need to improve there which they're doing with their newer SDM class.
With the other brands if you mostly P&S; they work great, with Pentax you need to know what you're doing. You can get away with sloppy technique using the others but with Pentax you really need to have more than introductory photography basics, this is just my opinion.
Pentax didn't keep up with "simplifying" the shooting experience for the masses with their DSLRs, they stuck to the philosophy from the old film days, people will be willing to learn photography and this is where imo they missed the boat.
If you look around here, the guys who really produce good images really know their stuff and then there are those who are willing to learn and their images have improved a lot (yes i've lurked here awhile before signing on) but like everywhere some get lucky ever so often with the "right" everything and capture that one good image never too be repeated again till they learn some more
Sorry for the babble but that's the mood i'm in trying to explain/discuss/argue *for and against* Pentax vs the world and i've used them all. The more i discuss it the more i come to realize as i've said above you either know how to shoot or you don't but are willing to learn and that's how we choose brand X over brand Y over and over again never learning what we truly want from photography or having some false sense of one brand being "better" over another, till we die. Unfortunately this is what humans are like.