JohnDizzo15 Offline Upload & Sell: Off
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There are too many pieces of kit being compared to give you a blanket answer on whether the size and weight will be a significant savings if moving to Sony as the lenses are not apples to apples.
The body will obviously already be noticeably different. But if you throw the Canon pancake on the 5D3 and compare it to the closest thing you have listed on the Sony side (FE 35/1.8), The 5D3 would likely feel better as far as being lightweight and nimble goes. Conversely, if you threw the Sony 55/1.8 on the A73 and compared it to the 5D3 with 50L, you'd tilt the advantage back in the other direction.
In all honesty, if weight and size savings are your top priority, the Fuji setup or a Sony APSC setup should be considered as they both have some great offerings. The only difference with my Fuji suggestion would be to take a look at the X-T30 since it is even smaller than the T-3 but with basically the same guts. The X-H1 was too bulky for my taste which is why it went back.
The Sony APSC options have been made great as well with Sigma jumping on board with the release of their trio of fast E mount primes that basically align with the Fuji offerings in focal length/speed.
If you are intent on sticking with Sony full frame, then I would take a look at the FE 85/1.8 versus the Batis. You'll surely get some varying opinions here. But I have had both along with the GM 85/1.4 and ended up with the FE 85/1.8. For me, it is a very happy median. Not sure how intent you'd be on the 35/1.8 either, but you might consider the Sammy 35/2.8 if you want the smallest you can get in that focal range.
One last thing to consider, although many around these parts don't care for it, is the FE 50/1.8. I get it though. It is optically inferior to the 55, doesn't have silent AF, has a moving front element, etc. Personally, I've had both and ended up keeping the 50/1.8 as it focuses plenty fast after all the FW updates. IQ is solid and it is actually noticeably smaller than the 55/1.8 (not to mention you can usually get a new copy for sub 200 bucks).
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