I've actually just sold my DX100 (although pending shipment). And I owned the NW-F807 for less than a week and returned it 'cos no hires support (then). But There's plenty of F & Zs floating around in the Ginza store with probably the same Japanese anime or J-POP tracks even to make it a fair comparison.
I'll bring my AK120 and HM-901 in there for sure but may not have the same tracks - and I highly doubt if I'm allowed to bring my own computer to sync my songs ;-). Will see what I can do though. Will be using my trusty TG!334 as my ref headphones (unless others have recommendations on earpieces they want me to try? Please look through my profile to see what earphones "we may have in common"). I won't be bringing big cans though so no TH-900 requests please ;-).