Tried looking on CX website, but didn't find the answer...

Booking business class to HK from SFO using BA miles - gift for my parents. Will they have access to any lounges? If so, which ones would you recommend?

Or...should I splurge and book them first class? They travel frequently to Asia, but only in economy. Read some reviews, but is first really that much better than business on CX?

Any advice will be greatly appreciated - TIA.