i just checked out SD5 price against PP8,
abt SGD700 diff
sadly i didn't get to try out the PP8 but if it's like a ER4SR on steroids (more detail and resolving)
then i guess why not but hey am told SD5 has better treble extension (i love slow decay)
I've never enjoyed the PP8 one bit, but the SD5 I was taken by immediately.