You are in the first-class carriage, yeah? That's so like you, Koichi!
They must be making a ton of money if they have an office at the best location in Ginza.
I won this bacon keychain when I took first prize in the bacon costume competition.
When you're equal to one you are the very top. You are first class and first rank. In fact, you are the best.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. いち gets shortened to いっ though, so watch out for that if you want to remain the best, yeah?