I too just got my K-3 on Tuesday , along with a K-01 , and a couple of Limited lenses
Both cameras are simply stunning - that the K-3 is so was no surprise , but I was very pleasantly surprised just how good the K-01 is with the DA 40mm Ltd pancake lens I bought to accompany it . The K-01 is the replacement for my Canon G11 compact and , although a bit larger , is still small enough to tote around and is streets ahead on image quality .
I have yet to try either with my collection of SMC-M glass built up over the last 40 or so years of shooting Pentax .
Since I am still running a PowerMac G5 ( dual 2.5GHz with 8Gb RAM ) on 10.5.8 which is the highest OS the machine will support and CS3 along with LR 2 , both of which can be taken no higher on this machine , I had anticipated that it would not recognise the PEF files from these cameras . Up to now , the G5 has been more than sufficient to handle PEF files from my two *istD cameras , and the Nikon D300 I use at work , as well as HDV video from my Sony HVR V1e editing in FCP 6 .
However , with the advent of the new MacPro , there are loads of people offloading the previous model Mac Pro for bargain prices and I have just bought , but still awaiting delivery of , an 8 core 2008 Mac Pro , onto which I can install Snow Leopard then upgrade to Mavericks before I take out the Adobe CC subscription for PS and LR .
In the meantime , I have found that LR2 opens my DNG files from both of the new cameras , although the G5 now seems quite slow for the first time . I haven't attempted to use Photoshop CS3 yet , so I don't know how it will cope .
My new machine will hopefully arrive in the coming week , it was posted yesterday , so not too long to wait .