My thoughts from a m4/3 (G3), K5 user and having tried the K-01 on a couple of occasions.
EM-5 - If you go for this, its the best m4/3 camera that there is atm.
IBIS, Oly JPEG o/p and the current best Panasonic 16mp sensor.
I'd give up on the Pentax lenses are concentrate on the native lenses are perhaps add a 45/1.8.
In fact the lenses you have is already very good.
I never got to using my Pentax lenses on m4/3 much.
They are heavy and chunky with an adapter and the 2x crop makes them too long.
Neither are most of the lenses as sharp in the center compared to the m4/3 primes (though distortion and end sharpness the m4/3 lenses are typically quite weak)
The noise still going to be at least 1-1.5 stops behind the K5 (so about the same compare to K-01)
Overall, a much smaller package IF you use the native lenses.
K-01 - Viable option and perhaps the best one for Pentax lenses.
Right sized and button placements are ok. Its pretty close to standard Pentax layout with the emphasis on most/all controls on the right.
You benefit from a wide open aperture (which means a LCD that does not need to boost gain as much and therefore less LCD noise ) when stopped down.
You'd get Av, AF and full lens functionality as well as focus peaking for MF.
For the lack of EVF, you can use a LCD-loupe when the need arises.
I use one every now and then on my K5 LCD and MF hit rate goes up into the 90's even w/o focus peaking.
I think John Flores has a good user report on his blog (do check it out)
What Blog is this? NEX7 - To me, its only attractive with you play with M, LTM lenses and other exotics. Personally, I'd just get a 5n or GXR for it.
Then again, they got that wide angle edge color fringe problem which needs to be corrected with software.
The 3 scrolls wheels is an illusion of usability if you use MF lenses.
The aperture control is already on the lens. You only need one wheel for shutter speed in M mode, or again only one wheel for EV compensation in Av mode.
So in practical terms, 5n will do just fine.
No native lenses that are really worth it short of maybe the 24/1.8; 30/3.5 and 50/1.8.
Rather pointless to get a not too cheap camera just to complicate life with an adapter and manual everything for the nice Pentax lenses.
My few cents.