How fast and accurate is the AF?

Great set as usual Simon, I never manage to get a crash on camera, I used to be a marshal at the kart track and so tend to "observe" crashes then once everything comes to a stop think "damn I didn't get a shot"

My motorsport shots are here I have of late shot with a recently acquired DA*50-135, the last meeting was wet so came into its own, before that I mostly used the Sigma 70-200 OS with occasional use of the DA*300. This I found a little restrictive and only use, if I'm lucky enough to have a second body, for distance shots. I have even used the DA*16-50 on occasion for real close work. Take a look at May (The Welsh) at the back end are some shots of the winners on their lap of honour in a 1950's D Type Jag
My weapon of choice is either the 50-135 or the 70-200 depending on the weather.

Your eyes expect some converging due to perspective and to straighten everything makes the building look odd almost as if the top is "fatter" than the bottom.
The top image looks more right to my eye than the bottom one which looks like it is leaning out at the top.

How much of a hit will that take out of the Pentax revival

GWS Stuey

What about your export settings in LR4

And WR!!!

Unless you have fingers like pork sausages there is plenty of room with all the K-7 derivatives!

Very simple indeed, however there appear to be many that struggle.