In terms of image quality, my sense is that on the whole Cosina value engineers the lenses to a point where you are getting 90% of the quality at 10% of the price of the comparable Leica offerings. And in some cases (35/1.2 e.g. - I am sure others will have their favorites) the C/V lenses give nothing away on IQ at all. I am very glad that Cosina has entered this odd market niche. Think of all the folks who have been able to try out RF photography because Mr. Kobiyashi has indulged his passions. It is great to have options . . . and often options (e.g. for a light, inexpensive superwide like the 15/4.5) that just didn't exist before Cosina started down this path. The result? Increased fun quotient for all of us!
