ANA from Tokyo
My quickest entry was less than 10 minutes. I arrived on the ANA flight at around 10 a.m. in the morning - no other international arrival. There was 1 mobil-lounge for F & J passengers that left before a second came to pick up Y pax. Arrived at Immigration with lots of booths open and was the first in one of them. No bags.
Even as a United 1K, I picked the ANA flight to avoid the afternoon madness.