I actually think 4 is probably my personal favourite as well tbh.
Rob that 5D has had a right caning since I bought it. I must say I debated long and hard between the 5 and a 1D3, and it was drag racing that kinda made me want the higher fps of the 1D3.
In the end, I went with the 5D...and im kinda glad I did, cause I dont think I actually miss anything. If anything it saves me time...cause now im choosing the best shot from a stream of three...rather than about 8 or 9 hehe. This was its first time out at the raceway, and im quite chuffed with the results.