DP: Just tried the AMEX Biz Gold after the recent expansion to 4X transit category. My statement just closed and it evaluated my top 2 categories.

It earned 4X on my mobile Suica reload. It did *not* earn 4X on mobile Pasmo. I did not and will not bother trying ICOCA.

Pretty sure this is the new leader for point earn in Japan though and you can funnel such a huge percentage of spend through Suica.