I bought both the 21 and the 28 recently and I always run this test just to see if everything is symmetrical and nothing has any issues like I had with 3 previous Sony 35mm 1.4. Im on my 4th copy of that lens and I finally have one at 2.8 the corners match left to right. Yes been through the war on that but I think I won the battle. The Loxia 21mm as you will see is exactly what a lens should be and I have a stellar copy it seems. At 2.8 both corners match and even better its even really great at 2.8 across the frame. Don't ask how but I think I have been blessed by the corner Gods but the lens is killer through the aperture range and lets call it F4 looks no different than 5.6. Now that I got your attention , you want it it will cost you 5k. ROTFLMAO
Okay that was the good news. Now onto the Sony 28mm F2 after you look at the Loxia its a little disappointing but lets put that into perspective this is 3x less expensive of a lens at US prices new at 448.00. So yea at F2 its not great across the frame and it does take a bit to get there although the lens is even in both corners at all apertures so not asymmetry issues and centrally this is a nice lens. I do like it but you want corners sharp than stop down, its just that simple. I would like folks to confirm this looks like there copy or not. I want to be sure and if not Ill return it and get a brand new one. I bought the 28mm at KEH and I have a few days to return it. So let me know what you think.
One the 21mm focus is just before the hard stop and really its really at infinity pretty much. I can test true infinity but honestly this copy is great and might just be a waste of my time.
Both lens centrally are very good and I feel no need to go through that work. But lets take a look at this test
I did Full image view of each lens than at the widest apertures i did both upper left and right just to make sure they are equal which they look like they are . Than I just did the upper left stopping down.
One issue is the hood on the 28mm is not the hood that comes with it. I never use original hoods but metal screw in hoods. The 28mm hood is to big and caused some vignetting in the extreme corners so I ordered on that will work better. Nice buying lenses from me because I never use the caps or the hoods that came with the lenses as i store them and use cheaper caps and hoods. No reason to be loosing 40 dollar lens caps and folks they do get lost at some point.
Sony 28mm F2
I do have distortion correction on in Capture One and it did apply it to the 28mm but I don't think there is one for the Loxia 21mm yet as flipping the switch on and off caused no change