Been there, done that...
Went from a 10D to a MK2. Do it. No comparison in regards to AI Servo, frame rate, buffer size and speed. It's just silly how much better these factors are compared to the 10D. High ISO wise, the MK2 is better than the 10D, but not ridiculously better. You still see noise at 1600. The thing I did notice is, for some reason, the MK2 responds better to noise reducing programs than the 10D did. I use Noiseware Pro, and although I still like the look with out it better, it does "clean up nice"...
Other things that aren't as important to everyone... Build quality, the view finder (waaaay nicer), feel, and the ability to customize it in every possible way. I had a 1 series film body before getting the 10D, so I was familiar with the layout and feel. The camera is just nice to use. I know you can get a wonderful picture with any camera, but using a 1 series just adds to the fun. And the truth is, equipment does factor in when you are shooting things like low light sports. You could take a picture of a static, well lit, subject using the 10D and the MK2 and probably not tell which cam took the pic by looking at the prints. Add to the mix low light and fast moving subjects, the attributes of high performance cameras and lenses show through...
MK2 or MK2n? You'll have to decide. There wasn't enough difference for me to pass up a decent deal on a nice MK2.
1D MKIII | FujiFilm X10 | 24-70 f/2.8 | 70-200 f/2.8 | 135 f/2 | 85 f/1.8 | 580EX |
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