Arrived back at AMS today and saw the CX HKG gate with a 340 instead of a 747

I'm hoping to get more info from CX what they will be flying on friday... Are the 340 first seats really that bad?
As is looks now the itin is this:
Fri 20/7 AMS-HKG CX270
Sat 21/7 HKG-NRT CX504
Sun 22/7 NRT-HKG CX501 (in HKG at 1445 to do some shopping downtown)
Mon 23/7 HKG-AMS CX271