Nexus 4 versus 5 loudness

[Valerian]

Hello,
 
I have a Nexus 4. At max volume, unamplified, it barely has enough power to drive my Sennheiser hd25-1 ii. Barely loud enough for the subway.
 
Does the Nexus 5 offer more power to drive my headphones or can I expect the same ?
 
Thanks !
 
Phil.