In reply to AlanLittle:
To clarify, I was asking about variation in size and fit for the same model in the same size - ie if I have two pairs of La Sportiva Miuras (for example) in UK size 9, will they be the same, or near enough the same, that if one pair fits perfectly, the other will too?
I guess this is probably the sort of thing that varies by both manufacturer and model, and is largely dependent on the manufacturing process, but a lot of people talk about sticking with the same shoe in the same size for years, so I'm curious as to whether this is restricted to specific models or if it's a fairly common thing across most/all shoes.
I'd say dead on with the 5.10/La Sportiva divide though - My Verdes and Blancos were a 9, while my Miuras were a 7.5, and I'd say all three have been of similar comfort once broken in!