I have a CL. SOme people say they can use the widest edges of the VF for a 28mm angle or view, but for me it's a bit of a stretch as I need to move my eye around to see each edge in turn, so it's not exactly natural. So for me, the 35mm view (outside of the 40mm lines) is about it. When i use a 28mm lens (rarely), I just guess the extra since i dislike external finders on the hotshoe.
'Hope this helps. BTW, the 28mm lines on the Minolta CLE ARE EXCELLENT.