Hi m8!
Well it´s such a hard question to answer since everything is subjective. But when you run it in 80s mode and modern voicing it sure can get really saturated. Not that Mesa Rectifier saturated, but sure is kinda modern, and can get really fat.
Having that said I have not felt the need to use an OD-pedal on channel 2-3. But then again, I do not play that type of music.
It´s just a super versatile amp. I use it for a cover band where we play classic rock. AC/DC Van Halen Thin Lizzy etc. I also use it as my main amp in our bluesband.
I just love it, have been looking at other amps but nothing I have tried comes close to this. But as I said, so hard to answer, buy it from a place where you can return it if you dont like the sound.