@bymy141: the Fuji sensor is 1/18 of the k200d sensor... but I don't find that this ratio is reflected on the DSLR optic sizes... I think there's a different way for designing optics for APS-C sensor and also different is the way for designing optics for 3:2 sensors instead of 4:3. The APS-C optics are more compact... even the ones at F2.8.
BTW while the main question has just an answer, my complains are caused by the fear of having AF problems... AFAIK the less the brightness the more the AF problems (or the more the AF is slower)... ok, brightness isn't the only thing affecting the AF performance but it seems to be the main one (well, it could be stupid a lot to just shrink my brain with this things while I still not have bought my k200d...).
Let's take what I do yesterday (22/2/2009): there was a cycling race here... again I was the official-(unpaid)-photographer*... I got a 18% of out-of-focus shots where many of them are located in the second part of the race (when the sun was setting) just because of a 1.5 stop less light than the first part (I got better focus shots in all the pre-focused panning takes I did).
Thank for all your answer!
Bye
Jenner
* - BTW I got one of my shot published by a local newspaper... and this "fighting" against a Canon 50D and Nikon 1D!