Y'all are missing the point. There's no "right" or "wrong" answer when you are standing on that cliff .. for me (not for you, for me) the answer today (not for all time, for today), was to ratchet it on back because (and here's the important part) I don't have a real solid reason right now to move to FF.
The K-3 is a great camera that meets all my needs, so I don't have a real NEED to go FF, I just WANT to, cuz I am a victim of marketing (and my long 35mm past). But if I am honest with myself I have yet to face a situation where the K-3 RAW file didn't have enough info to accomplish what I wanted. The only reason I could give right now to jump to FF is because I shoot wide way more than long. So one day I will switch. But that day ain't today.
You want more reasons? I got 'em.
1) Native Glass. At present, the native mount selection is not that great. So I'd be in for 2-4 years of LBA and lots of $$ -- especially when I start seeing those superwide native primes come out. But right now, as far as native glass goes, the 16-35 zeiss is the best bet -- and probably the thing that had me leaning most towards making the jump.
2) Pentax glass compatibility. Yes, I can use my FF glass on an A7ii, but that comes with a loss of utility for Pentax (no AF, ltd aperture control) versus using Canikon glass. That's not forever, just for now. (Why do you think I got that 31/1.8 FF glass?).
3) Size and weight - My original push to mirrorless was to not carry as much weight or as many lenses around. After looking at what I would (realistically) end up with, the savings in the size of my kit was not enough of a diff from the K-3 to push me to jump
4) Travel kit. The reason I was thinking of jumping now was to put a new lightweight kit together to test drive on some trips I have coming up. But after looking at the options, it came down to an A7ii with the kit 28-70/3.5-5.6 and the Zeiss 16-35, along with my Pentax 50/1.7 and either the 100/4 macro or 135/2.8 v the K-3 with the 16-85/3.5-5.6, 55-300, and 31/1.8. The thing that clinched it was the lukewarm reviews for the Sony Zeiss 28-70/4. The 18-70 kit lens I was going to end up with gets pretty good reviews, putting it about on par with the pentax 18-85 in IQ. So, for me, differences in FF v APS aside, the quality I expect from the Pentax kit given how I will use it was going to equal or better the quality I expected from Sony .\
Or, to put it another way, I decided I'd rather have the 31/1.8 than the Zeiss 16-35.
So I stepped back from the cliff.
YMMV.
Last edited by EstimatedEyes; 02-11-2016 at 04:22 PM.