You asked
Is the leica vario elmarit sl 28 70mm f 2 8 asph worth buying used?
Yes, I think it's a good candidate for buying used. Good lenses hold their value and last for years, and the used market is one of the best ways to get pro-level gear for less. Check the lens carefully for wear before you buy, though. It's a 28-70mm f/2.8 zoom for full frame with no stabilisation, so you'll rely on good light or a fast enough shutter speed.
It's built for full frame bodies on the L-Mount, and the SL line is the obvious partner. The Leica SL2, Leica SL2-S and Leica SL3 are all good matches.
Whatever body you buy used, budget for a new genuine battery. Old ones lose capacity fast. See buying used.
Written by Claude from this site's pages.