NW doesn't operate flights in Europe, that's KL.
Extra inches? You might want to spend some time in the KL forum. Do a search for "Europe Select". In short, there are no "extra inches". In fact, the likelihood is that you'd be crammed into the same 3x3 seats with
more people than if you were in Y. It's hilarious to board a plane with a Y cabin that's half full when C is packed to the gills. On two occasions I have moved behind the curtain on my own in order to have an empty seat next to me.
But at least you'll get a salad with that butter & chive sandwich!
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-alan in sitges, home of the new, improved
Si-Re-Do