I once flew on a FB award JFK-SVO-TLV in J, where the JFK-SVO leg was on a DL 767 and the SVO-TLV was SU 777.
No lie-flat on SU 777 in J, but the lie flat on DL 767 was definitely not something to write home about - extremely narrow.
On the SU leg we (DW, myself, and just under 2 year old son) had the almost the entire cabin to ourselves, and with a cute little boy, you can imagine that flight attendants were happy to do anything for us. It's a rather short hop, so nothing really remarkable. Amenity kit seemed like it's from the 90s.
SVO business lounge was quite crowded. I had a good shower (excellent towels - unlike VKO which gives a disposable towel, slippers etc), unfortunately the hot water was malfunctioning in the shower cubicle that DW used. All in all, nothing to look forward to in the lounge.