I wish I could tell you from experience about the A-S701 but I can about the A-S1000. Built like vault, quiet as a mouse, very "accurate" or let's say natural in it's presentation. IMO, no over emphasis in any part of the frequency range. Just smooth from top to bottom and with good detail.
I know of two people personally who own the A-S701 and they could not be more pleased. They are are both(as well as I) driving efficient Klipsch speakers so no stress or strain on the Yamaha is present. The built in DAC is a bonus IMO but stepping up to the A-S801 will offer a better option with the ESS 9010 chip.
Bill