> In Japanese they write the numbers the same as in English ("4, 6, 8")

Modern Japanese has two numeral systems - Arabic and Chinese. The Arabic numerals were introduced to Japanese relatively recently (only in the modern period). In pre-modern Japanese, only the Chinese numerals existed. In contemporary Japanese, Arabic numerals are more common, but Chinese numerals are still used in some contexts (especially texts written vertically)

https://en.m.wikipedia.org/wiki/Japanese_numerals

I don't know about you, but I write my 1 in just one stroke of the pen. Also I use a space as a thousands separator, and you need to write 一万 in Japanese for 10 000, not just 万 by itself. That makes for a closer game:

一 / 1 (one stroke vs one)

十 / 10 (two strokes vs two)

一万 / 10 000 (or 10K) (four strokes vs five)

When you get to numbers like 5462, there's no contest versus 五千四百六十二.