[Guest]

The contax 35-70. This lens is small, light cheap and good performer. However, there is a 'look' produced by leica and contax lenses so you might prefer the leica. The 28-85 is optically ok but has more laca; is large and heavy; suffers from zoom creep and is a bit more expensive. However, if you want the increase focal range it is well respected (the weight and zoom creep are big negatives for myself).

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I have no personal experience with the leica so take these comments with a grain of salt.