The Mjolnir doesn't make the LCD2.2 sound thinner than the Lyr, unless you consider the massing of midrange details "thick". In all respects, I consider the Mjolnir as an upgrade from the Lyr. It presents a lot more detail and dynamics across the full spectrum of the LCD2.2.
I've been reading some reviews on the Mjolnir and quite a few people mention that it is too bright and one guy even mentioned that it sounds thinner than the Lyr. Is this true? I was starting to warm up to the idea going from Lyr+Bifrost to Mjolnir+Gungnir but now I'm not so sure. The reason for swapping is that I feel the Lyr+Bifrost sounds too thin specially in the mid bass.