AF first class, particularly on the 77W, is well favored. The ground service with a connection makes transiting at CDG actually a pleasure vs the normal avoiding at all costs. The A380 F hard product is showing its age but still you get a solid soft product.
Qatar J is rather nice particularly on the 787, A380 or A350.
EK's J product varies by plane. On their 777s is generally 2x3x2 which isn't preferred for more solo travelers. On the 2 class A380 it's 2x4x2 with backward & forward facing seats. On the 3 class A390 the J product is 1x2x1 which I believe is the afternoon EK flights from AMS. Complimentary limo is a nice bonus but go product over perk. EK uses the Aspire Lounge at AMS instead of a proper EK lounge.

BA F class is not worth it in my opinion. Staff are polite & professional but the product doesn't hold up compared to others.