don't know if you upgraded already, but i was in your position about a half year ago
i had the sr80i's and contemplated getting the q701s after auditioning my friend's
i have to say, both headphones are great and good for the money. however, q701s definitely are more premium headphones
cleaner, higher fidelity, neutral, closer to transparent
..not as "crunchy" (i dont know how to use "proper" audiophile terms but thats what it seems like to me) as the grados
that includes bass, which iim7v7im7's post explains in detail, which is nothing like the head-pounding bass of denons,
but i really enjoy the q701's reproduction of bass. the lower notes from a cello really come to life.. one of my favorite things about these headphones
also, i feel like the grados "resonate" a whole lot more, leaking sound like mad but creating a really "visceral" experience (there go those terms again... haha
)
so i definitely miss the grados from time to time. but in the end, the q701s bring the same experience in a cleaner, fuller sound
i've been really happy with them and have since handed down the grados to my little bro
one last thing, you really need to have a good setup to enjoy the q701s. low impedance amp, a good dac, and quality music make all the difference.
that said, i dont have the best setup, but i enjoy listening to my mix of flac and 320 kbps mp3s through my Yulong DAH1 DAC and Schiit Magni
Hope that was helpful, for you or for anyone in the future who are considering the q701s
If you have any questions, feel free to ask. best of luck