My friend in Dallas Tex...has a highly successful photo business, large studio and impressive list of clients. Shoots with a D3X and two D700s, all the best strobes and lenses.
Bought a K5 for his trip to Europe this last Spring because of the size and the DPR review.....and from using my K5 for a short shooting spree with the 43 LTD mounted. He loved the K5 and it is now his main camera outside the studio.
In a recent discussion where I mentioned that many(?) in Pentaxland were clamoring for FF....his response was ...Why?
I kind of think that if you are not getting what you want with the K5 and the proper lenses to match, FF is not going to change much in your photography. You are likely to lose more than you gain. Just how I see it, based on people more knowledgeable than me that shoot both ways.
Regards!