My Sony RX1Rm2 pairs one of today's best FF sensors with a 35mm F2.0 Sonnar and gives me the best IQ in a small package. 35mm suffices for 75% of my images and as a bonus with the fixed lens I won't have any sensor dust either.
This is not an inexpensive camera but, besides some filters, I can't spent additional money on other accessories, or lenses.
'The question is not what you look at, but what you see' - Thoreau
Sony A7R3, RX1Rm2, RX100M6 & a lot of fun