I think the CGA games are an unfair comparison.. That's more like an 8-bit machine and was released in '82 to boot. However, if that's the only conversion around, that's all there is, but a note should probably be made about that.
I'm curious, too, about the speed of, say, Stunt Car Racer. You can get WinUAE to approximate a 7 mhz A500, but what kind of processor was DOSBox getting close to? (Maybe it's nothing, but I'm wondering if it's close to apples and apples or apples and oranges..)
(I know the video wasn't some perfect scientific thing, but just a couple things I'm a little curious of..)