Yes, I am really worried about that with you, haha.
Except I own both devices (and not just armchair-expert'ing it) and can tell you without a doubt that the Note 4 lags exponentially more than the 6 Plus at best. The 6 Plus has occasional frame drops with Notification Centre or Control Centre (almost non-existent on 8.2 though, so I'm happy they at least fixed that), whereas the Note 4 is clunky with pretty much every app, and choppy especially with core apps like Gmail (taking 5+ seconds to load if not already loaded), Hangouts (pauses when sending messages), and Play Music (everything from opening the side menu to pulling up Now Playing induces a choppy, hesitant transition).
But go on, keep using the same specs argument. Seems to be the go-to buyer's remorse response these days (especially popular with the Note 4 owners).
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