I think only their mirrorless designs are worth using on RF cameras. The DSLR ports are super awkward on E-Mount or L-Mount.
With that being said, their DN mirrorless lenses are brilliant. Their 24-70mm f2.8 DN is beautiful, as is their 85mm f1.4 - smaller and more lightweight (by a long shot) than their DSLR equivalents.
But I think their new "i" line is the most brilliant lens lineup yet. I love them:
https://www.sigma-global.com/en/lenses/cas/special/i-series/ - can't wait for these to be available for RF Mount. Those alone are almost worth using L-Mount.