Originally posted by Uluru I however think tools themselves, as they are now, can be used professionally. Maybe not for everything 100% dependably that comes to your mind, but for a great deal of photography, definitely.
You see, in all these we need to discern the perception others are forcing upon to us, and how well we understand the subject matter.
Main reason Pentax gear is not used widely as a professional tool is the lack of established service channels, lack of training outlets or workshops, very scarce presence in shops, where we can seriously try the equipment before pulling moolah out of our pockets.
FF absolutely isn't necessary for the job done; if the "FF look" is needed, then renting of a 645D for the occasion will more than suffice and surpass anyone's expectations.
The main attribute of a professional photog aren't amazing tools but amazing creativity of mind that help see beyond and above tools.
I recall you extolling the virtues of larger sensors (aka sketchbook vs large oil paintings) elsewhere?
But you're not wrong. I'm currently getting acceptable images from a K20D, albeit with a number of serious limitations both functionally and creatively.
The latest generation of APS-C camera from Pentax would undoubtedly be a significant improvement (even the K5ii), but there are still limitations to creative options available.
I have been totally open to the idea of an APS-C only system, but having been on the ground I am speaking from personal experience (not forced perceptions) when I say I will need a FF camera in the not too distant future.