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Gotta call bullshit on the 'whole different league', at least in the case of oakley vs foakley (IMO, anecdotal, n=2, etc...). There are differences in the lenses (thickness and scratch resistance being the most notable, minor optical differences if you're really looking), but they are no worse than any other £10-15 pair of sunglasses and definitely not ~10 times worse, the price of oakleys implies.
IDoNothing-
You're welcome to call bullshit, it's just my experience. I've had 4 or 5 pairs of fake Oakleys now and I've given up on them, the lenses are so bad you may as well buy cheap sunglasses from a decent brand.
By bad I mean the depth of field changes around the lense, they scratch easily, they glare easily and they actually become harder to see with when in bright light.
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Probably more true if you never wear them over the eyes.
Sumo
fussballclub
I've said it before but the main difference is the quality of the lenses. Fake ones are in a whole different league.
I've got some Bloc Titan's at the moment and they're still pretty cheap but the optics are just as good as the real Oakleys I've used.