How does longhaul First class on BA (787-10/ A380) compare with LH (747-8/ A380) and UA (777 or 787)? Currently, BA roundtrip in F on SEA-LHR-Italy is below $7K, while $13.5K+ on LH/ UA.

I usually fly UA or DL, and one of the original objectives of my trip (apart from my destination) was to fly on the 748. However, seeing that big difference in price made me rethink my original choice of flights.

BA is by far cheaper and eliminates one connecting point. But I do not know how they compare to LH especially.

Thanks for any info!