Anyone considering the upcoming FE 28/2 lens? I little bit wider would be nice and I'm not sure on the quality on the wide converters. The 21mm converter would be nice, but the bulk on the front doesn't suit me. Might have to stick to my Leica 21 until they do a bit wider or wait for Zeiss.
What is there not to like? Price? Size? Sure, it is bulky, compared to the RF lenses, but you get two focal lengths for the price of one. With AF and at f/2.0. It is not cheap, but also not 'Zeiss' level pricing.
I have a feeling that a lot of people will actually prefer the FE28 over the FE35Z, because of the extra f-stop and the wider FOV. I think that the lenses will be comparable in size, and the real question is how much the difference in quality will be. Also, 21/28/55 makes for a reasonable range, you can skip the 35 in that setup. (I know it is a small lens, if you already have it).
With the converter, you do get a relatively inexpensive 21mm/f2.0 which makes the DOF more usable at wide open positions. 21mm is likely already too wide for street shooting, and we will have to wait and see whether or not this makes for a decent landscape setup.
Unless you have an A7s, the small wide-angle RF lenses are cumbersome to use - vignetting, color cast, corner smearing - and FF legacy wide-angle lenses are simply large. The FE28/UWA combination looks large, but I expect it to still smaller than FF legacy lenses and also be fairly light - kind of like the E20/UWA combination on the APS-C E-mount cameras.
Comparing the FE28/UWA with the FE20/UWA makes for a FF f/2.0 versus APS-C f/2.8, which is two stops advantage.
Similarly, comparing the FE28/UWA with the FE1635Z makes also for a 2 stop advantage (f/2.0 versus f/4.0) at the cost of losing OSS.
Either way, it is a nice f/2.0 option to have in your bag.
The alternative, imho, would be a Loxia lens around 20-25mm at f/2.0. MF, but higher IQ, I am sure.