I have had great luck with Sigma. I had a fantastic copy of the Sigma 30 with the same bad reputation that I sold when I got a 5D. I have since sold the 5D and repurchased the sigma 30 again and this copy is just as good. I have had seven Sigma lenses and the only less then stellar one I have had was the non macro 24-70 f2.8 that was soft at 2.8 but focus was fine. I am prepared to take my chances and if I have to send it to sigma no big deal.
EOS R5, RF 100-500, RF 800, RF 600, RF 2x TC, RF 1.4x TC, 400 DO II, 1.4x TCIII, 2x TCIII, 200 f2L IS, Tam 180 macro, 135 f2L, 135 f2.8, Tok 16-28, 50 STM, RF35, 28 f1.8, 40 STM
A7r4, A9, A6100, 200-600G, Sig 105 f1.4, Zony 55, Zony 50, Sigma 24-70 DN, Zony 35, 28, 24GM, Sig 20, Sam 14 f2.8 AF, MC-11, 2xTC, 1.4xTC
GFX50r, GF50 f3.5, GF250 f4, GF 1.4X TC