The Sony 7c is a good camera if all you want is to use the 28-60mm F4.0-5.6 kit lens and use it like an advanced point and shoot.
The moment you attach other Sony FE lenses on it, it is no longer a light weight system.
Don't keep focusing on size and weight of FF camera bodies, forgetting that you need to pair it with lenses as well
Medium Format Lenses are always larger and heavier than FF lenses and
FF lenses are always larger and heavier than M43 lenses (law of physics)
The difference in body weight between FF and M43 may only be 100-200 grams
but the difference in size and weight of their lenses can be a few times more!
A Sony 90mm Macro Lenses weights 602g and is 8.2" long.
A Panasonic 90mm equivalent Macro lens weigh 250g and is only 2.5" long.
Is the Sony 7C system still as portable when you need to bring an extra 1 or 2 lenses
on an Outdoor Trip?
I am not against Full Frame systems. By all means go for a FF System if you really need
the extra resolution and dynamic range. But do yourself justice,
get the A7 Mk3 or Mk4, plus invest in their superb G-Master or Zeiss Sonnar series.
Don't delude yourself and talk about some small size range finder full frames cameras
with a kit lenses and think that it is a cheaper and much superior portable system than M43.
Put the Zeiss 35/2.8 and 55/1.8 on it.
Any m43 equivalents?