Originally posted by biz-engineer .. It's funny.
When Fuji and Sony introduced mirrorless models, years ago, there was all this arguing in Pentax forums that DSLR was too big, and mirrorless was so much smaller.
Now, I read the comments in DPR forum, about the Panasonic S1R: "As for the size of the cameras, all I can say I wish my Sony A9 were as large as these [S1/R]."
Well, I found that out with my Nex 7 andA7R. At the time I also had an A850----much more comfortable to use, and I don't have huge hands.
My first serious camera was a Rollei 35LED---sweet little thing but it hardly had much in the way of knobs, rings, or buttons to manipulate, and the ones it did have could be fiddly. All this weight/size business is a bit quizzical. My experiences backpacking and portaging on canoe trips is that what makes as much difference as the weight is the way it is carried. A crappy strap is going to be uncomfortable over time no matter what. Thus it pays to spend extra time getting a good one (for you).
I lucked into a fantastic strap for my 645Z, and I can carry that all day easily without any discomfort. Bags are the same, although if it's a single shoulder model just being unbalanced takes its toll---I do a hybrid commute that involves 5-8 miles walking a day plus a train ride, and a heavy messenger bag can be wearing.
But for ergonomics, cameras can be easily too small, and it's better if they are a bit too big than a bit too small, IMO.