It's honestly best to treat the flat k47 as an entirely different capsule. Someone on RGO described it as a "dark ck12" response which I understand (and it's very flattering). Obviously it doesn't have the pure rear rejection of a ck12 by a longshot in the mids or lows, but that sort of linear and broad off axis response is something the flat k47 shares. But without the actual depth of rejection, which is less than ideal if the room isn't great. It's definitely roomy capsule. It gets wider the further it goes down with all the benefits and detriments of that, which makes it a killer OH and instrument mic. You can get a focused HF sound and the even mid and bass response of an wider cardioid at the same time this way. a flat k47 is currently on permanent OH duty at rancho de la luna for this behavior. It's also fantastic on piano for the same reason. its use cases are very different than a regular k47.
To illustrate this, here's a neumann K47 (blue) vs a flat k47 (red) in 0 and 180 degrees:
so yeah, it's considerably wider. The crossover in behavior in the lower mids is also way more graceful than the regular k47, which is why it doesn't have that kind of throaty ~400hz hump on proximity that the normal k47 has that I often hear on vocals on the m49
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