I have great respect and admiration for Denon as they along with Marantz, SONY ES,Pioneer Elite are among the top Japanese manufacturers, having said that, Yamaha needs proper speaker matching to sound their best and when speakers like Paradigm, Axiom, Yamaha's own are matched, the resolution and accuracy of Yamaha is far better than Denon but you might find the Yamaha harsh and bass shy at first and as for DAC, Yamaha does their own work on DAC and their DSP chips are derived from their musical instruments making them quite accurate and musical. Yamaha has been a pioneer at this field and were among the first on market with DSP units like their DSP-A1000.
This is my personal, subjective opinions just like the ones you see before my post. You should form your own opinion doing a A/B comparison and leave everything to your ears by doing a thorough, comprehensive audition of your own with materials of your choice. Opinions on the forum is a matter of forming a yardstick of sorts if you can call that, you have to live with what you select eventualy so dont let anyone, including my opinion cloud your judgment or decison.