You never want to underestimate the images you can make with a 28mm lens.
The length is a true classic.
David Burnett told me 25 years ago at a Maine Photographic Workshop that you had to have one. This was back in the day when a photographer like David traveled the world with four lenses.... 28mm, 50mm, 100mm and a 200mm. None of those crazy zooms for David... of course he won every award worth winning on his way to becoming Magazine Photographer of the Year... World Press Photo of the Year, Robert Capa Gold Medal, Overseas Press Club and the White House Picture of the Year. A nice collection of hardware, so maybe he knows what he's talking about.
Working in Haiti this August I took along the Zeiss Biogon 28mm f2.8 for the Leica M9 and Zeiss Ikon film camera. The lens was fast enough at f2.8 for most indoor situations. You can usually hold a rangefinder at slower speeds if the subject isn't moving so shooting wide open at 1/15 or 1/30 wasn't an issue. The image quality at f2.8 is very high anyway.
One of the great features of this length is how the subject jumps away from the background if you get up close. These two boys were hanging around the inside of the church as we interviewed school teachers looking for work. The subject is large enough in the frame but you are still see the where they are.
For many situations the working distance between the photographer and subject is comfortable and feels safe to both participants. The subject lies comfortably in the frame as well.
If you want to order the Zeiss 28mm, just send me an email. I also have great cases for rangefinder shooters at my retail outlet.