Admittedly I differ from many others in my choice of lenses. I have found that a wide angle is almost always the correct choice and a telephoto a poor choice. I'm not sure why this is. The concept of "Getting more in" is probably part of it but a small part. I am quite excited by changes in perspective. For this reason I find the (28mm) lens to be a good choice.
In reality it is a bit longer than I most often use(d) with my Nikon but quite acceptable. The above photo's are all shot with a Nikon DSLR using the 12~24mm lens at 12mm. With the chip size factor this equates to about 18mm, unusually wide for many, just right for me.
When my Granddaughter Emma was born, "Can you believe I'm six?" I purchased my first digital camera. I also attached a Contax TVS point and shoot film camera to my belt, right next to my cell phone. The TVS has a 35 ~ 60mm zoom. 35 to 60 should be called "Zoom?" it ain't much. Reviewing the images shot at each end of the range though I found that I almost never was unhappy when choosing 35mm and quite often was when I chose 60mm.
What this tells me is that if Sigma offered an identical camera with a longer lens I would NOT be part of the rush.