A friend/employee at the store where I pre-ordered my K-7 called me yesterday to tell me the Pentax rep was there with a pre-production K-7 and the 2 new WR lenses
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I had about 15 minutes to play with the camera, with the new 18-55mm WR lens as well as my own FA35/2 and FA77Ltd.
First off: everything you've read about the faster AF, quiet shutter, superb build quality, etc is true
The camera feels really good in the hand, the grip is deep. I'd say the weight is similar to the K10D. The controls are well located, but there are a lot of small/subtle differences compared to the K10D. I did not feel the angled front e-dial made a significant difference in handling. I'm not crazy about the new location of the Green Button, but that could simply be a question of habit. Ditto about the lock on the mode dial.
The AF selection is no big deal, as previsously reported. Once you press "Ok" to get into "AF selection mode", it remains active until you press "Ok" again or change the shooting mode.
The quick-access to settings via the "Info" button has a nice touch: you do not have to go "into" an item to change its value: simply navigate to it using the 4-way pad, then use the rear e-dial to change its value.
The AF speed difference with my K10D is night and day. The K-7 would consistently lock focus in little more than half the time the K10D needed, and it hunted less. I did not try it in really low light, however. Neither did I try AF.C.
The shutter sound is an absolute delight. The K10D emits a leisurely "clak-clak", while the K-7 sounds off with a quick, muted "flap-flap" (it sounds more solid at the same time). The mirror blackout time feels correspondly shorter.
The camera was setup in continuous-high (5.2 fps) drive mode when I first took it, and I had trouble taking only one shot at a time. Must learn to release the shutter button more quickly
I can't comment on IQ, as I was not allowed to put a card in the camera, and it was running the very old 0.20 firmware anyway. I'm confident it will be at least as good as the K20D, and that's good enough for me.
All I can say is, now I
really can't wait to get mine (still first in line at that same store !)