We are in an agreement.Are we in agreement that better glass with a 50D will be better that a kit lens with a 1D4? Or not? My sports shots did get better when I paired my 50D with a 70-200 IS f/2.8 and improved a bit more when I went to a 7D. Saving my $ for a 1Dx. I'd like to get the shots in between the ones I get with the 7D as the frame rate goes from 8fps to 12fps.My ability to shoot sports with a 50D went up greatly when I got a 70-200 IS f/2.8. Put your saved money toward a better camera in a year or two and go for great glass. A 1D4 with your current glass will get you mediocre shots but at a great frame rate.+1
Glass, AF or good MF, the reasonable ISO + correct exposure time make the image look great, not fps...
(Or 5d3 for better low light AF. I have 1d4 and FPS do not help much in 95% of sports, you need to catch the exact moment.)
(Better glass improve the technical quality of an image the most. I listed some characteristics that influence an IQ the most.)
(I have set 9fps on my 1D4, because AF needs more time to follow the subject than it is available in the highest FPS, but generally fps do not help me in group indoor/outdoor sports or any athletics disciplines - only one moment is the best and it is needed to press the shutter release just before the moment. I've also used spray and pray :-) with new camera, but now one shot at the best time is better technique for me...)