The difference in pricing between high resolution full frame cameras and medium format cameras has shrunk considerably. When you look at the current sale price of Nikon, Sony and Fujifilm mirrorless and even DSLR cameras there is very little difference. However the only Medium Format camera in this price range is the 50R with the 50mm (40mm in 35mm equivalency). Size wise the 50R is larger than the other cameras with the exception of the D850. All of these cameras are fairly light and small enough to do street photography.
Medium Format Kit
Fujifilm Mirrorless GFX 50R Body and 50mm f3.5 LM WR Lens at $5199.98 CAD
D850 DSLR with Nikon AF-S 35mm f1.8G ED lens at $5468 CAD
Nikon Z7 Mirrorless with Nikkor Z 35mm f1.8S lens at $4998 CAD
Sony A7R IV Mirrorless with Sony Sonnar FE 35mm F.2.8 Carl Zeiss at $5448 CAD