Just thought I would post an update now that we have some spare time in Paris, about our second leg DOH-CDG
The lounge itself cleared in the 4hrs we were there. It went from a long line to enter the food area to ghostly abandoned town within that time.... a very odd feeling. After reading many commments above, I now also realise the shower situation was currently adhoc due to renovations (that's why we were directed to "spa" by the attendant and the actual "shower" sign directed us to nowhere).
The situation about the female/male toilets being separated by 200m (located at the two different "wings" of the lounge is that: in betwen the toilets, there was... everything.... including spa rooms, game room, prayer rooms, reception, etc. The effect, for a first time goer is: you see the female toilet, you go: the male one must be right in the vicinity. You walk a bit, found all these other rooms, then you think to yourself: It must be in the other direction. So you walk back. Find all these others rooms on the other side of the female toilet... then you go: hmm... I must have overshot again... so you walk back again.... paying greater attention this time, but nonetheless do not find the toilet.... After a few zigzags like that, it got frustrating for me.... LOL
On buses and transit security: we didn't have to do either. Actually didn't realise this was a thing until reading the comments above. Luck of the draw I guess.
Onto the flight: this second leg was suspposed to be a non-Qsuite flight (where I pre-selected our seating) but somehow, without us realising it, it became a Qsuite flight (we assume for operational reasons) and we were automatically given the same seat we had on our first leg. This time, the seat and surrounding hardware was much newer - operated better, looked better. But as it was a day flight, we didn't bother doing the bed configuration again.
The service on this leg was actually much more superior compared to the first leg, primarily in that the attendant always remembered to shut our door after each interaction. This was a very nice touch. They didn't do that in our first leg. It also meant it was easy to request service: we just had to open our door and then an attendant would know we needed something.
The food was, once again, great. Unlike Singapore, the menu was almost completely different. We had both cavier and lobster as entree. That felt special.
At the airport, by sheer luck I guess, our luggage were the two earliest pieces to be conveyed. So we made it to the hotel in record time to start our holiday.
Overall rating of Qatar J? Very good, especially as we were lucky enough to get the 90k saver redemption. Will fly again at 90k. Probably not worth the more usual 180k.