This centrally located mega-multiplex is chock full of big-budget luxuries. The semireclining seats are roomy enough for even the most ample popcorn-fed tushes. The monstrous screens do justice to even the most audacious CGI effects. The sound systems pump more decibels at audiences than Logan’s runways do at Eastie residents. And if one show is sold out, there’ll be another screening starting down the hall in five minutes.