I love my Nikon Scope (Philippines made) very clear and bright under all conditions, I've compared it side by side some Euro and USA stuff and honestly I can't see SFA in it 99% of the time, maybe just that little bit sharper image but honestly there really wasn't much in it TBH and certainly can't say I can see 5 or 6 or even 10 times the price diff.
P.S. even those who owned the US and Euro scopes were surprised just how good it compared to their more fancied scopes (and we compared them in daylight, low light, last light and under spotlight.
I certainly haven't had a need to spend 1000's $$ on a scope and the most expensive one I have cost $1300 plus and honestly it's no brighter, sharper or do anything better than the Nikon does.
I think a fair chunk of the cost of some of the more expensive scopes can be attributed to their wages, our $$ v theres, taxes and duties etc.