One of the big reasons to get an interchangeable lens camera is for wide-angle photography. Some point and shoots go as wide as 23mm, but none match the 15-27mm (35mm equivalent) field of view that the Sony 10-18mm f/4 Wide-Angle Zoom Lens ($849.99 direct) delivers.
Quite sharp at wider angles; Fixed f/4 aperture.
Exhibits rectilinear distortion; Some softness at 18mm.