In general, how much better (or worse) is the business class of AF and KL vs DL?

Prior to Covid, I have flown D1 almost exclusively across the Pacific, and I like the A350 suites the best. I am SEA-based and the A330neo seats are acceptable. Service is alright, but not exceptional. Food, prior to covid was hit or miss.

Since the pandemic, I decided to become a free agent, but open to still flying some SkyTeam members. I just completed a roundtrip transpacific on KE. I may be in the minority here but I seem to prefer the DL seats because of privacy. KE seat is somewhat too firm for me. There is no place to securely set a CPAP device. Cabin is warm. Food is consistently better but options are quite repetitive and boring. Service is 'better' but somewhat robotic.

Pre-pandemic, I have flown on CI but only between Taiwan and Japan. Cleanliness, food option and quality, as well as service were all exceptional. Then again, this was on a competitive route with a very discerning market. I am not sure how they are longhaul post-pandemic.

(I am planning on trying ANA for my next transpacific flight.)

I am planning a trip to Europe and I wonder how the business class of VS, KL and AF compare to that of DL and KE?

I know I said that I am a free agent, but many SkyTeam flights to EU seem to offer competitive fares for the routes I am looking at for 2024.