As was reported a few days ago, the G5 SE isn't that special; it's essentially a lower-spec version of the G5, packing less brunt for less money. The 4GB of RAM in the flagship has been downgraded to 3GB, while the new
Snapdragon 820 has been similarly taken down a peg to the Snapdragon 652. The SE does have the same 5.3-inch IPS display as the regular G5, with the same 2560x1440 resolution. That's crazy good on what seems to be a much lower-end phone; with that in mind, it'll be interesting to see how it performs.
Hi-Tech@Mail.ru does say that the screen lacks brightness, though - apparently this is to reduce power consumption. The SE has the same 2800mAh battery as the normal G5, which David said had mediocre battery life when he reviewed it a few weeks ago, so lower screen brightness may be a good thing in this case.
