I'm looking for a few wide angle lenses for my Sony A7R and R2. I have been watching a few ZM lenses on ebay and wondering if there is any difference at all in the optical formulas between them and the new Loxia lenses? I'm looking at the 35 f2 and 21 f2 at the moment. Has anyone had both or done any research to see if the Loxia are just re-housed ZM versions or not? Prices and specs seem to be very similar.
I'd also be curious how the Batis lenses compare optically with the others.