Firstly, Thank you everyone for your comments! I must say, after looking a bit at the Mamiyas I'm not too impressed, as said they're heavier but they also appear to be rather complicated in their design, rather unergonomic. I prefer the simplicity of the hassy's, but at the same time the Rollei's look interesting (6003 & 6008). I'm definitely going to have to have a little play with them. Not sure if I can find any dealers in town though, Gothenburg is obviously more of a Hasselblad City...

Also I found the comment about the contrast levels in the Mamiyas compared to the Hasselblad lenses rather interesting. I have heard of different optics manufacturers performing differently before, but does anyone know why this is the case?