I do love that 4.2 2F in my 60.I own a N57 inline 6 turbo diesel and it is awesome.
Inline sixes are naturally balanced. Next naturally balanced is a V12 which is 2 inline sixes, which is indeed excessive for most use cases. It is not surprising that Toyota started the Land Cruiser line with an I-6. I wish they would have gone that route again in the latest models including the 300 series.