I haven't heard iPhone 5 yet...maybe it's also pretty good Just spend some time to study the sound chips inside iPhones, I'm pretty sure people will tell you which one is better

You can buy a power bank for $10-30 bucks BTW, then no battery issues...LOL

5S sounds better than 7/8/9 IMHO. Sound quality got downgraded each time Apple upgraded their product lines under Cook's leadership for the cause of cost saving...no matter iPhone or Mac...now they even drop the headphone jacks...how stupid it is. Miss the Jobs days.

But personally I don't care about the display at all... I'd rather they could spend the display money on better CAPs or pots or PCBs...

Second it if you really want to see the volume display

I think LCD 2/2c is a side step from HD650

People often sell pretty new HD800S (from couple of months to 1 or 2 yrs) for around $1000 in the for sale sub-forum here

Forgot to mention, your DV336 can also drive HD800S, because it's a high Z headphone. But LCD on the other hand will need a new amp...tube amps normally won't drive low Z headphones well.

LCDs won't have the huge soundstage in HD800S

HD800S offers much more details, a firm upgrade from HD650

iPhone 5S

Sennheiser HD25

looks good

300B amps do work on both headphones and speakers. Sometimes you need some cables or adaptors to make it work.

Tube sound is much better than SS.