Just to clarify what i was trying to get across and not too well i fear.



The red ellipses are what i perceive to be tell tale signs of not enough mesh density, I would be very surprised if that was purely down to HDR aliasing but of course i could be mistaken, without seeing the model.



Again on this image red is as above, green is HDRi reflection aliasing from a HDR that's potentially too low in resolution for the scene it has been applied to, this is fine as most render engines give you the option to blur the reflections and to a certain degree this can be fixed with using anti-aliasing.

I hope this clarifies the points i was raising.

Martin Spencer-Ford