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Depends on the tips you wear and the fit you get with each of them.
I was using Sony Hybrid tips (not-included), which I thought were comparable in isolation but slightly more comfy than the stock single-flanges. My other choice in tips was the small tri-flange set.
I haven't worn the M6 in the city since late May so I don't remember enough to specifically comment on the isolation in day-to-day city life, but I remember that they were able to attenuate helicopter noise well enough that had I not been required to wear an aviation headset in the chopper for communication, I could have done with only the M6s (but the aviation headsets were obviously better at noise attenuation).
TL;DR - reduced IRL helicopter noise to less than pain-inducing levels
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