I have a large head as well (or at least lower than average ears) and with the longer posts, I have no comfort issues with the LCD-2. In fact, for me the only phones more comfortable are the HD800's. The K701's didn't even come close to covering my ears, luckily I thought they sounded awful so it didn't matter. It seems like Sennheiser typically has the most adjustment range.
Yes, my pair came today, and I'll need the longer posts for long term comfort. The clamping pressure is a bit high but I'm confident it's manageable with some "adjustments".
I have a pair of Revel Studio 2's that are my reference, and these are not far off. That is no small accomplishment. Hopefully with some tweaking / break-in I'll be to get them even closer.