In my case, the difference is even more drastic. I carry 2 bodies and at times, even 3 for my photo trips. My current bodies are a M240 and a A7R. But if I did not have the M240, I will probably add another A7. With 2 A7's the difference in weight is over 1kg! Moreover, with the M240 or A7R, I can make do with a smaller and lighter Gitzo traveler tripod. I have back packed my equipment to remote and at times extreme places, Namibia, Ethiopia, Inner Mongolia, etc. Having to trek or hike several km in sweltering heat or extreme cold is tough. Any savings in weight and volume is always welcome.