The 23mm 2 is a small and outstanding quality lens. I generally ran it min 2.8, more usually f4 and was always happy. I've had a couple and would have another. I just got a 23mm Viltrox as a second choice because I'm a bit skint and wanted to get back into Fuji after selling everything due to a period of no work coming in (freelance). I couldn't justify the extra £70 on a used Fuji vs a used super mint Viltrox. I had the 85mm Viltrox last year, and it made some great images, tho I barely used it. Anyway, I've only done test shots with the 23mm and am happy. As with any (every?) lens, it is a tad softer wide open but firms up well at 2.8, with much better corners if you pixel peep, and then at 4, it's excellent. The build is great, looks sexy, and AF is zippy. I like it. I don't feel I need to return to the Fuji, other than size. 23mm is my most used travel lens, so the small Fuji suited me. The Viltrox is somewhat bigger.