Good to see you here!
I think if you use a 28mm, distortion is very much noticable
in objects close to the lens so using it in interiors is out of the question for me.
I do all interiors with a 35 and if i need anything wider for outside, which is actually rarely; I stich
How is the Japan shoot going?
do you speak about the 28HR?
i use this lens a lot.... and would suggest to give it a try at least.
i dont have problem with distortion,- its between 05 - 1% which is in most case not noticeable at all.
same about the schneider 24xl which even is in this aspect slightly better.
both are great wideangles on alpas,cambos and so on.
wouldnt like to work digital on architecture without some lens which is wider than 35mm.
so i do the same as you do with your 35. i stitch sometimes with the 28HR which results in a fov comparable to a 22mm lens. still not an extreme wide... compared with the "old" 4x5" wides as was the 47xl.