Never played a Maz so I don't know how it compares. But anyways, a word of warning. Or should I say reality check?
Yes, Mark V is an awesome amp. But - it is not be-all-end-all. You can get lots of awesome tones from it that cover a lot of ground. But it doesn't do everything imaginable. Take distortions, for example. It can give you selection of different distortions, raning from medium gain to extreme high gain. But: all of them will sound Mesaish. No matter how much you tweak it, you will never mistake it for a Marshall. Or even a different Mesa like Dual Rectifier. Even the different Mark preamp circuits do not sound exactly the same as the original amps due to differences in the power amp stage.
Still, it is an incredibly versatile amp. It can give you suitable tone for virtually any occasion and any style of music. What I'm trying to say, just don't get your hopes too high. Or you will be disappointed. At the end of the day, it is just an amp (although a darn good one). Not the Holy Grail or the Philosopher's stone.
So should you get rid of your pedals to get a Mark V? That really depends. How much do you rely on your effects? Mark V will give you Reverb, and a solo boost, plus built-in graphic EQ and of course more than enough distortion for most purposes - but that's about it. If you need a chorus, a flanger or a delay, you should stick to your M13 at least. As for pedals that change the amp's distortion character or maybe completely replace its preamp distortion with pedal distortion, opinions differ. I would suggest that you don't really need an overdrive or a distortion box with a Mark V - but if you're like me, they can still be fun to have around. For example, I love to emulate (sort of) the "overdriven Marshall" sound with the Edge or Crunch mode, EL34 power tubes an a TS808 clone pedal. Or kick in a Wampler Triple Wreck on the clean channel to take me instantly into the 'faux Recto' territory. Not that you really need them with a Mark V but I for one love having more sonic options at my toetips.