I wonder if The difference you note in Cappellis is due to bespoke versus rtw as he does sell to stores as rtw.
Some of the differences you note, will be subtle, some less so. Do let us know how we might spot the difference. I suspect evenness of stitching requires dissection to reveal it but the balance to the sides and stitching at the join point might be noticeable to some extent. Difference in Interlining might be noticeable immediately and over time, etc.