In reply to stroppygob:
> Thanx!!
> Well it cost more, so it has to be better....
Well if you are going purely on cost then Hannes has answered your question
"the lower the number the better series it comes from. 1 series is aimed at pros, 5 series pros and enthusiasts, 6 series enthusiasts and so on"
but there is no point in spending £5000 on a 1Dx when a 6d for £1200 will be just as good for landscape photography, and a 70d for £800 will be better for video in most situations. It would be a waste spending a lot of money on features you don't need.