Gasping at the gun barrel (though I'd still like to see it fire from above).
It's the same thing only better which is inkeeping with the idea of the second Death Star being an improved version of the first.
As for panels the original location of the firing sequence was identified sometime ago and it's almost as was:
http://starwarsblog.starwars.com/index.php/2009/06/08/los-angeles-steam-plant-responsible-for-obliterating-alderaan/