Had L2 for few days, this is exactly what I reported on our french website, to me L2 will be better than many closed competitors in this price range (Momentum, K550, MD1R etc...) but still it did not compete with my HD600 or HD700.
The biggest problem of the L2 is its construction: being semi-open in transportable segment sounds strange to me. If I need isolation on the go, I'll take my IEM or a closed headphones like HD25/DT1350, if I don't need isolation, then I would take HD600/700 any time.
Yeh I agree, if you need isolation use IEMs or something more closed. I was thinking maybe Philips could make a cap to go over the grill to increase isolation when needed. If I cover them with my hands (obviously) the isolation increases by quite a bit.
I am going to search for something the exact size that doesn't look stupid. I'll report if I can find something.