Most of the soffitts I have seen have sharp rectangular corners.
My builder just asked me if I want a bull nose corner bead.
There is no extra charge for bullnose versus rectangular corners.
I have never seen one of these or if I had seen them I didn't pay attention.
Will bullnose corner have any impact on the sound quality?
Would you consider bullnose a contemporary or traditional look?
I can't imagine that it would affect sound quality. I have my soffits angled at 45 degrees which I had a lot of trouble finding like examples. I've been extremely happy with them as they are less intrusive of the space and let me angle my rear and surround channles towards the listening area.