What has this world come to when we discard measured data in favor of opinions?
Well, here's some more data to ignore...
I just measured the output of the 1A and 1Z. They both measure exactly the same, BTW. All measurements are on the balanced jack using high gain with a 1Khz test tone. I don't have a QP1R here to test, so all I have to compare with is the manufacturers published specs.
Into 300 ohm load = 2.06 volts (14mW) A slight edge on the QP1R at 12mW (approximately 17% higher).
Into 32 ohm load = 2.02 volts (128mW) 3 times the QP1R's claimed output of 40mW.
Into 16 ohm load = 2.0 volts (250mw) The only posted dated for the QP1R into a 16 ohm load is 16.3mw (Wow!).
This data shows that the Sony and Questyle have a somewhat equal maximum voltage output, but the Sony is capable of delivering MUCH more current.