They all start at 28mm equivalent. The S120 coming out next month starts at 24mm equivalent which would be a major plus on indoor shots.
I am contemplating the G1X but what you have cited above has me hesitating. I am a realtor and currently use a 24mm for my presentations. I think that the large sensor would upgrade my presentations but getting a good shot of a small room is important. How much of a loss of ability do you think that a 28mm is from 24mm?