You have a good collection of 50's more than enough I think
I was a Pentax user but switch to Sony Mirrorless and now have the a7iii, I have the 90mm macro and love it, plus the kit lens and the 24-240 and the 28mm at the moment the sigma art is heavy from what I have read but pretty impressive, I havent decided between the sony 50 05 55 and the sigma, also on my wish list and I may only ever get one of these before I retire and will have a limited budget are the 12-24 wide angle