Originally posted by alamo5000 I am kind of of the school that rather than just purely 'small' the camera needs to be balanced and comfortable.
A note on the whole balance issue...
A few years back I bought my Sony A99-based Hasselblad HV and, over the course of a year or so, built up a small collection of decent quality A-mount glass including several quite large and heavy models - the Sony Zeiss 24-70 f/2.8 SSM that came with the camera, a Tamron 70-200 f/2.8 USD, and a Tamron 150-600 (G1). Not long after that, I bought a Sony A7 MkII - primarily to shoot my growing collection of vintage Soviet lenses, but also as a backup / second body to use with my A-mount glass via the LA-EA4 autofocus adapter.
The HV is quite heavy (more so than the A99, due to the body materials used) and balances beautifully with the 24-70 and 70-200. It's even perfectly usable hand-held with the 150-600 for short periods at a time. Knowing how much smaller and lighter the A7 MkII would be, I was resigned to the fact that it wouldn't handle at all well with these relatively big, heavy lenses. But I was quite wrong...
When shooting the HV with heavier lenses, the left and right arms share the load in, I would estimate, a 50/50 to 70/30 ratio respectively, depending on the size and weight of the lens. When shooting the A7 MkII with those same lenses, the weight distribution is more like 70/30 to 95/5 - so the left arm supporting the lens is working harder, and the right hand acts more to steady the whole setup. That may sound awkward, but to me it doesn't actually feel any worse to shoot... just different.
Some folks may genuinely dislike the combination of bigger lenses and smaller, lighter mirrorless body. If that's based on their own experience of shooting that setup for several days, weeks, months or - as in my case - years, then it's a valid conclusion - yet very much a personal and subjective one, like my own. However, I strongly suspect a number of people who criticise the balance of a mirrorless body plus large lens do so because it sounds plausible and/or it's what they've heard in various forums, YouTube videos and other web resources. Given that, it's best to try out a combo for yourself and see how it works for you