For my back of the envelope math, a BiS Monk has a melee damage + weapon damage of 45, and does 2.2x that amount per round (VTD rolls, 19-20 crits). So I'm looking at the top of the damage pyramid being 99 damage a round.
990 over 10 rounds.
Let's compare with Wizard using the new Legendary, using MeC each round, with Cabal Set and RoSS to get the most spells out, and Crown of Expertise.
SB = Spell bonus below, call it 30 for BiS wizard. If you don't like 30 plug in your own number.
L0 = Level 0 spells - I have 7 of these (1 from swapped Acid Ray)
L1 = Level 1 Magic Missile : I have 7 of these (4 from swaps)
Let's just spell swap all Level 2 spells and Lesser Maze into magic missile - I'll worry about crits once we understand what on earth is going on with "of focus" items and slid spells - because no joke my slid spell damage bonus is like +10 I think
L3 = Lightning Storm is worth: 20*2 + SB
I have one of these on the card, one in RoSS, and one in Crown of Expertise
Room 1 - 3 rounds:
Round 1: L1 + Cabal L0
Round 2: L1 + Legendary L0
Round 3: L1
Room 2 - 3 rounds:
Round 1: L1 + Cabal L0
Round 2: L1 + Legendary L0
Round 3: L1
Room 3 - 4 rounds:
Round 1: L3 + Cabal L0
Round 2: L1 + Legendary L0 ('m out of level 1 spells)
Roudn 3: RoSS L3 + L0 (I'm out of spells except Burning Hands)
Round 4: L3 from Crown of Expertise
So over the course of the dungeon I cast:
7 MeC-ed Magic Missile = 7* ( (8+10)*2 + 30 ) = 462
7 Normal Level 0 spells = 7*( (3+10) + 30 ) = 301
3 MeC-ed Level 3 spells = 3*( 20*2 + 30 ) = 210
Total damage: 973
Wizard is dealing ~ the same of the Monk while being more or less out of gas (one Burning Hands left).
With less HP, worse saves, less AC, paying 50 HP to do it, no built in class features like Diamond Body, stunning fist, deflect missiles, etc. (+2 damage with wands).
To get this build you have to give up hands, wrists, and charm for Cabal set - or you take away 129 points of damage from 3 level 0 spells to do 85% of Monks.