Screwdrive is faster but SDM is the same but bites better IMO (It locks and holds focus with more confidence).

More to help push you all...
http://www.markcassino.com/b2evolution/index.php/Pentax-K-3/

http://photographicwanderings.com/2013/11/18/pentax-k-3-review-its-good-buy-it-u...

Ok in Nikon mount but it's supposed to be coming our way and I know there are a few people interested in it!
Relevance: Tested on a 24Mp body, which is where we seem to be headed now, not the same sensor but it'll give the general idea...

http://www.dxomark.com/Reviews/Sigma-18-35mm-F1.8-DC-HSM-A-Nikon-mount-lens-revi...

Unsuprisingly, they like it!

They've also just tested the Zeiss Touit 55mm, Don't look at it as despite the price you'll go all dewy eyed over the figures. Anyway that un's not for Pentax so doesn't count as a lens!

I have high hopes for the 120ish-360ish zoom, hopefully a Dc motor with a bit of zip.
Wonder if they will just HD the DA*s or re design them all, a quicker motor would be good and maybe an in body focus limiter like the Sony A99?

I keep telling you it will punch a hole thru time!

Some healthy debates going on surrounding the K3, so how about one more to round it off...

Diffraction...
So we all know what were talking about.
http://www.cambridgeincolour.com/tutorials/diffraction-photography.htm

Now My understanding, which may or not be right, so A, I'm looking to gain knowledge from those here who know a lot more than I do, and B it could help others too, which is always good.
So lets try to keep it good natured and on topic

Firstly Diffraction is by and large Lens dependent, so I am assuming a decent prime or a very good zoom here, which is not out resolved by the sensor. Secondly, the light falling on the Sensor has no idea which sensor it is fallling on anyway, nor how densly packed with photosites it is, so please lets not go off at a tangent! Any good quality lens at a small aperture on a higher resolution sensor will always resolve at least as much real detail as a lower resolution one of the same size, Caveat, Contrary to common belief I have not tried every combination out there but have yet to find an instance of this not being true Canon 40D-50D/D7000-D7100, to name just a few I have owned before. More densly packed sensors will resolve more detail at the expense of more noise but with finer grain, which can at times be confused for more detail which in turn makes comparisons with older less dense sensors difficult. Now I am personally not finding any difference between my old K5IIs and my k3 regards diffraction which suprises me a little, nonetheless I'm going to stick my neck out and say that, if you find a good aperture to use on the K-5, use the same one on the K-3. Your picture will never be any less detailed as a result of diffraction. There I said it, now tell me how wrong I am and crucify me!

Well my point though badly made mike was wishing for lenses but what I hear the FF k3 BIG is taking priority but maybe then we will get a fast trio to go with it...

True but they could at least make an effort! Ricoh has brought about one body of their own so far, lenses still to come, they seem to be critising the horse because the carts broke!
It is not RICOH'S fault, it was Hoya's I'll get all politcal now and blame the last labour government because the street light has just gone out outside my house...

One from over here, and what did I tell you, Sluggish AF!

IT'S THE LENSES STUPID!!!
Sorry...

http://www.whatdigitalcamera.com/equipment/reviews/digitalslr/129688/1/pentax-k-...

Bit late to the party but another vote for the DA*.
Mine however is not mint which really irks me, especially as I used to have Archies (Helios) old one which was beautiful!
Just noticed however that Sigma have recently patented a 300 F2.8 design, so hope for the future for those who really need it?

http://egami.blog.so-net.ne.jp/2013-10-29