Quote from Daal:
This move could be a game changer for the JPY. Because now the BOJ and MoF wont have their excuses for their inaction and incompetency. Essentially the SNB showed the entire world 'thats how you do it morons'. For Japan a move like this would be a double whammy because it would both solve their FX issue but would also help a ton with ending deflation. I cut back my exposure to the JPY materially today even though I think it might take forever for the BOJ to do this
Also as Ashraf Laidi pointed out, in terms of exports, the CHF is more closely tied to the EUR than the JPY is tied to the USD.
And as dhpar mentioned above, the JPY appreciation has been slower and smaller than the CHF appreciation.