Eric, this is my opinion based on having reviewed and used most of the sunglasses on the market.
I think the 580G (glass) lenses from Costa are the best of the breed.
I think the Costa 580P and Smith Chromapop lenses (both plastic) are rough equivalents and would come in at number 2.
I think the Costa 400, Oakley, Smith “standard” lenses, Kaenon and Maui Jims, which are all plastic, would be the next step down.
Below that you have Suncloud, which is owned by Smith.
And then at the bottom of “acceptable” fishing lenses you have Fisherman Eyewear and a few $25-30 clones. Those are pretty bad but they’re not quite the off-the-rack gas station specials we used to buy in college and throw away after three weeks.
Note: this doesn’t take into account Smith’s silver-based photochromic technology, which cuts light transmission as the sun gets brighter and which is unique to them. That’s kind of a side spur on the chart but it’s a useful feature.
Hope that helps,
Zach