>>3393704>laowa 25mmThat's the one that does 5:1 right? I looked up some reviews some time ago and didn't like what I saw and read, but it may be user error. Anything past 2:1 starts to become pretty hard to use and people can have a hard time doing a good review. If the lens is only using extension instead of optics to go from 2.5:1 to 5:1 then quality will just be as good as 2.5:1 with enough extension to reach 5:1. If the lens is made for 5:1 optically in the first place, it should be better. Unfortunately, it is a zoom magnification lens in this respect.
I suspect the 20mm 4.5:1 lens will have better IQ because it won't have zoom magnification. The Laowa seems to be more of a novelty.