Originally Posted by blwnhr 
To add my 2-cents to the focus speed and focus point debate I will refer to the 2 images I've posted links to below.
Having multiple focus points is essential. It is, especially in sports photography, not an option to recompose. Take the first image of a car, the focus point is set to the middle-right point so as to keep the front of the car in focus. In the soccer example I had the farthest-right point selected as I was shooting in portrait and wanted to be certain the subjects head was always in focus.
Focus was tracking on the front-left (camera-right) headlight. Focus was tracking on this boys face.
In sports shooting you need quick, accurate AF and high FPS. These go hand in hand, as we've discovered with the K10D. I, personally, would like to see at least 40D-grade AF, hopefully nearing D300. 11 AF points is good, some more would be better, but mainly accuracy and the ability to predict what is happening.
The prediction side of things Pentax simply can not do. I'm now finding myself shooting more and more sports and finding the limitations of the K10D AF system regularly. For examples like the one posted below the Pentax simply couldn't handle it, yet I shot the same corner with the same lens (both 50-500's) on a 40D and it was spot on every time.
Notice how the focus is on the base of the windscreen? The camera focussed on the front bumper, but because it couldn't predict where it was going to be it fouled up the focus.
This is most certainly a selling point. Not just for me, but a lot of others. There is a massive market here.
If Pentax can pull off a quality body with solid FPS performance and a spot-on AF system such as the 40D or even the previous 1D Mark II N then Pentax sports shooters such as yourself should rejoice. My concern is with the constant evolution of bodies there's still no support for long, fast lenses for the sports folk. The Nikon D300's 51-point area AF is quite phenomenal but if Pentax goes that route I would really hope they start pushing some more telephoto glass out in sync with such a body.
The example you posted is a common problem with any AF system, even my 40D and 1Dmk2n suffer the same fate with objects traveling towards camera (it's a depth perception issue) and Nikon's D300 and D3 have the same ordeal. The only alleviation I've had with this is strapping a 2.8 or faster lens (either the 120-300 Sigma 2.8 or the 70-200 2.8) on the 40D and using its increased AF mode with center-point. So Ben if you're reading this, put the bug in Pentax's ear about objects traveling towards camera with AF
