Wow. That is pretty loud!
I really like the effects on the vocal...what was done there?
By my standards it probably is on the loud side. I usually settle for -10 to -11db RMS, but sometimes things can be pushed further without any compromise (depends on a lot of factors, song to song). I think a lot of this ended up around -9.5 db, but that's a heavy -9.5 because of the amount of instrumentation at times.
[from memory] The verse vox are EQ, multiband compression, brick compression, mild stereo chorus, sibilance filter, and some reverb. Chorus is a doubled set of vox (panned 30% left/right), with same settings from the verse, and instead of reverb I used a mild ping-pong tempo sync delay.
On my tracks I like to feature one thing from each track, making it the 'lead' element throughout. In this song it was the bass. Sometimes, it's the drums, vocals, guitar part, synth, etc. Since most of my material gets bundled into album format this helps keep each song sounding relatively unique compared to the rest, rather than making it formulaic and having each track sound the same. It keeps it interesting for me as well, finding a balance between fresh and consistent is a real challenge [especially when it's up to a year between the first and last track being finished for the album].