[Brightcolours]

So the new one vignettes a crazy amount more, and that is (partly?) due to back element mechanical vignetting, causing the swirly bokeh.  It is much bigger, and heavier. It is about as sharp as the old lens, so not that different from the Tamron 24-70mm f2.8 USD VC. The old one has blue/yellow LoCA (at least at tested focal length), where the new one has the usual green/magenta LoCA.

 

That is what I get, from your comparisons and earlier samples.