Yeah, the movie is completly separate from the series itself, and yes, it kicks ass
I wish there was a Trigun movie though, the end of that series seemed extremely rushed...
Movies that compare you say? I dunno..but see Spriggan if your in the mood for some nonstop violence...
Cowboy Bebop is one of those completely original series, it has zen, and well....good luck trying to find something that even compares, i doubt there will be anything able to compare with it, in its on little genre i mean.