Apologies for starting a new thread. Being new to this site I would appreciate any advise you have

I will be travelling on flight EK352 DXB-SIN on Boeing 777-300.

Looking at services on this flight Emirates is advising Deeply reclining sleeperette seats in First and Business Class.....

Does this mean neither are lie flat? and apart from the width and pitch there is no difference in recline?

Is it worth the upgrade to first?

Many thanks