used to have that kit...wonderful...great camera, great back...amazing lenses...if you are used to looking trough the finder (meaning if you have a rollei system) it might be hard to give up the full coverage....but the finder image you get is still much bigger and brighter then any DSLR....
as far as the lenses go: i always thought about them in terms of slightly shorter 35mm lenses (since i usually cropped 3:4)...so the 80mm becomes a 70-75mm (35mm) lens....
only real drawback: no real wide angle lens....the 40mm becomes a 35mm (in 35mm terms)....
hope this makes sense....
