Canon EOS mount being already electronic is better catered for MILC than Pentax/Nikon.
It says quite a bit if they need to explore a new mount.
I used to say that the A7 was a system w/o the lenses.
But I think after this photokina, it has enough lenses for 80-90% of what most generalist shooters do.
UWA - 16-35/4
wide - FE35/2.8
normal - FE55/1.8
Tele zoom - 70-200/4;
All round zooms - 28-75; 24-70/4
Whats lacking are fast short teles and perhaps macro lenses, both of which are easily adapted and no issues used manually.
The camera is not well designed for long lens work, so specialist have to choose something else (namely the DSLRs)
The A7/s/r camera (if not the lenses) have been selling immensely well here.
Seems like almost all brand guys have one either to lighten the load (Canikon) or for the FF (Pentax, m4/3 folks)
Maybe its a cultural, generational gap thing as the folks here accept EVF as fast as they rush for the new iPhone6.
No "I'm not sticking my eye on no EVF" type reluctance at all.
(Its a big multi brand forum here btw, with 3.5K view per day at least, so this is not some guy typing from Antarctica research base, population=1
)
On the aps-c front, the Fuji has made inroads for the enthusiast market (not so common on laymen though)
The lure of fast lenses catered for aps-c on a somewhat smaller package (esp for Canikon users; not as much for Pentax users)
The styling and so called 'Fuji colors' help too.
Smaller formats, RX100II, the new LX100 are really closing in.
LX100, m4/3 sensor with a nice lens thats 24-75 f1.7-2.8 , almost all that a general shooter needs on one camera.
The MILC threat to the status quo is big and will certainly get bigger.
Just a year ago, I would have thought that Pentax should stick to a K3 type DSLR FF for the selfish thought that I can use my K lenses on it.
Today, I do think they should go MILC, shorter flange distance and just provide me with an AF adapter (aesthetics be damned).
The K01 concept can work too, but the special lenses that recess inside the mirror box area have to be launched at the same time to attract attention. (and it needs an EVF)
If history is a guide, then it has shown that lagging far behind with new implementations is to the detriment of the brand.
Slow to adopt the bayonet mount; late to AF; late to digital.
So here we are now.