[Spinifex]

Hum. Vignetting is awful high but otherwise seems nice. Would the cat eye go away if the lens had not been under-developed for the aperture ?

It probably would have needed to be much bigger, yes. That said, the 90 mm f2 does not suffer from such mechanical vignetting it seems, so it may be a trade-off for its macro capabilities. As always, it's a compromise between several factors. It's not the only recent lens that suffer from such swirly bokeh: check the Canon RF 50mm f1.2.

It may be a fact of life when you have the lenses sticking so close to the sensor.

Price - expensive - not sure about build - these lenses haven't been around long enough to tell. We know that what his name was pretty impressed with the latest canon lenses when he took them apart - has he said anything about the fuji? I forget which lenses have the highest failure rate - for some reason i thought fuji was fairly high.
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I remember Klaus having issues with the 55-200 and it was basically not repairable - and I've heard of others with similar issues but perhaps the issue is specific to that one lens.

There was a 55-200mm teardown by by lensrentals here: https://www.lensrentals.com/blog/2016/02...-teardown/