Lets be honest in some cases the body can make a world of difference (and yes I know the lens is important too)
If it didn't why the constant upgrading to later models or crossing over to different brands?
Can a K7 compete with the likes of a Canon 5D mK11 or 1dsMk11 for pro landscape photography or wedding photography, the all round ability of a Nikon D300/700 or the Canon 7D for sport photography.
Yes be realistic of your needs and purchase the appropriate tool (also considering the budget).
I for one initially laughed at the the need for clean Iso 1600/3200 etc but now I am now seeing how INCREDIBLY USEFUL it is.
Yes I can get a clean enough presentable shot with my K10D (which is still a fantastic performer) at ISO 1600 but if I was having to consistently shoot at these iso's and beyond then I would look for the tool that allows me to do this with less sweat involved.
A shot like this at ISO 1600 without flash would have been impossible a while back - the body/sensor with noiseware removal has now made this possible - with the likes of the 5dmk11/D700 and the kx etc it becomes even easier
Dylan
Dylan