I have found that they are all pretty much the same in the back.
If you can swing a seat up front you will find a huge difference.
On overseas flight I have some limited experience in business class.
I would rank British>American>Lufthansa.
Lufthansa is way overrated, IMHO.
In a couple weeks I will be flying US, Swiss and Eva in business class. Looking forward to trying them out.
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I'd love to fly business or first class, but I'm happy to get an aisle seat these days. Please let me know how you rate your flights on this trip, if it's not too much trouble.