[davidmanze]

 

If the lens weights in excess of 1.5kg, the camera doesn't really matter all that much anymore in terms of extra bulk.

 

   It's not by accident that Canon/Nikon/Pentax etc. have such a similar wrap around hand grip,  and when you bolt on a long zoom you really need it!  For sports/nature you need a camera that's locked into the palm of your hand, not something you hold with your fingers!