So, I compiled all available MBTs as of Test Iteration 1 and how their Armor is changed compare to 0.32 + some feedback.
All tanks are shot at by T-14 Armata's upgraded APFSDS, which has 850mm of penetration.
For all 0.33 screenshots, the first screenshot will be at 100m, and the second at 320m (which is basically as far as you will engage in PvE for 90% of the time). It should have roughly 750mm of penetration at 320m.
Challenger 2 ATDU
0.32
0.33
Thoughts: The ATDU is the biggest loser of 0.33 no question. Even at 320m, the weakspot is at least 2-3x larger than live server (keep in mind, at that range your round has only 750mm of pen which is basically Tier 9 Penetration). At 100m, the armor is nothing but a joke.
T-14 Armata
0.32
0.33
Thoughts: Contrary to the ATDU, the T-14 is the biggest winner of 0.33. Its turret ring is no longer a weakspot, while its lower front plate did not receive any change - if not become stronger thanks to APFSDS increased penetration drop off.
XM1A3
0.32
0.33
Thoughts: You would think removing the turret ring weakspot is good for the XM1A3 - well, you are wrong. Reason being now, your ENTIRE LFP is a weakspot to basically all Tier 9 and Tier 10 APFSDS, at only ~720mm RHA against Kinetic rounds. Good luck fighting other MBTs which will lol-pen your unhidable LFP.
Merkava 4M
0.32
0.33
Thoughts: Another big winner in 0.33 - the Merkava 4M. Its armor is mostly untouched bar the removal of the tiny weakspot under the gun. With the new penetration drop off plus now its best-in-class DPS and DPM, good luck fighting it.
Leopard 2AX
0.32
0.33
Thoughts: This is one of the tanks where a good job had been done. Upper plate is now properly protected, but the LFP remain completely vulnerable - which is to be expected from the Leopard line. I would call this balanced - Well done (for once).
Type 99A2
0.32
0.33
Thoughts: Armor is unchanged for the most part. BUT there is a caveat - there is now multiple roof weakspot that isn't hard to shoot at as long as you are taller than the Type 99A2.
I am not quite sure this is intended or not, and you WILL get penned there by those new 1000mm pen HEAT rounds. Watch out.