Used the new JAL F lounge on Sunday. I thought it was quite nice, lots of staff, massage chairs, selection of hot food and good quiet areas. Not that large. It is directly across from immigration.
As a a OW Emerald, you can use the premium entry to security after checking in, if checking in at the A end of the hall, the premium entry is off to the left of where 'the others' go through, on the side. Not that easy to see at first.
New CX lounge is much better than the old one, but very standard.