ANA do operate -400D's.
Winglets are for drag-reduction, they boost the -400 range by 3%
On the short-haul Japanese routes this is not needed.
When the original 747SR was developed in the early 70's, then called the 'Super Airbus!' Boeing had hoped to also sell this aircraft to India, China and US domestic operators. But all SR/D versions have only ever sold to Japan to serve their unique requirements.