Stats for update 7.3 have been added.
Update 7.3 brought the Swedish heavy tanks. As it is often the case with new tank lines, those are first played with more experienced & better players distorting the average WR statistics for the tanks. Emil I player population offers a great example:
Of the Swedish line, the tier VI Strv 74 seems performing below the average. I liked it personally, but based on the numbers it does not perform that well.
The tier VII Leo seems performing also below the average for the better players. I liked it personally, but maybe its lowish DPM (still higher than the T20) pushed the Relative WR down.
The tier VIII Emil I is the gem of the line and currently the best performing tier VIII Tech Tree heavy tank. Players have been crying it needs to nerfed, but let’s remember that the Emil I is only the 4th best performing tier VIII heavy tank. Its superior performance on the battlefield is also greatly contributed by its better-than-average player population (3.9% higher average WR vs. all tier VIII heavy tanks)
The tier IX Emil II performed very much the average. I would say the EMil II is perfectly balanced.
The tier X Kranvagn was an disappointment for many and it performs the average (below the average for good players). WG often tends to launch new lines with borderline OP-performance. It might be that WG thought the Kranvagn has so much positives that players would play it in any case, and they decided to launch it as balanced. Launching a new line balanced feels almost like launching it nerfed since the standard is borderline-OP.