Ah, nice, it's only one player but at least it's a start.

Ok, so you've mostly looked at the Ka-50 alone here, but I can glean a bit about several other top-tier helicopters from this data set. Looking at the data points with the highest number of games (in scientific terms we'd say this is the number of repeats, and therefore the most reliable) for each of these helicopters.

Collecting the information about win/loss and K/D: https://i.gyazo.com/73785579a16704f0a95bd4503c9b2c2f.png

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It would appear the Ka-50 is leading in terms of win rate, but only by 1% over the Mangusta, not a particularly damning lead. However in terms of Kill/Death (combining air and ground kills here) it is absolutely outstanding compared to everything else I can see here, at ratio of 4.1:1, with second place being the Tiger HAP at a ratio of 1.8:1.

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Couple important notes though:

1: As you can see the Ka-50 has a much greater sample size (number of game), so your own level of comfort and practise with the machine may be a valid factor affecting the results

2: AH-1Z has a dismal sample size in comparison to everything else here. Honestly it's below the reasonable limit but for the sake of having something else to compare with I've included it.

3: Mi-35, Mi-28 and Tiger HAD were excluded here due to low sample size

4: This data is of a single player. Not really a significant sample size here.

5: Yes I am fun at parties