Just can't see the logic of a mirrorless with K mount. Can't imagine what a dissaster it would have been if the NEX were to be A mount.
K mount MILC for K-mount lenses
A bit narrow in the casting of the net, but still not totally illogical.
Looking from an all mount user perspective, yes, of course the best would be another NEX like, short flange distance system to mount all those M lens and other exotics.
But looking from a Pentax or brand perspective, it certainly isn't wrong to keep to an existing mount.
Esp. when one already has a rather large base of legacy lenses (and customers) and already have smallish primes for APS-C ( 'A' mount can't have a claim to "smallish' lenses).
It also means straight forward compatibility to existing lenses. Not via adapters, not by workarounds and such.
As to why NEX has quite a few users (a success as you call it), look at it this way :
1. Sony brand will always sell better due to brand visibility (esp for the layman in SEA region)
2. Its often a 2nd system for the serious enthusiast, just like a m4/3 or GXR.
3. Its a body success, not a system success since most folks use their M; EOS; AI or other mount lenses on it.
Don't forget, M lenses are not cheap, and many of the exotics are not that cheap too.
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