Photography related issues, different lens effects under the same situation.

First of all, the depth of field of 70200 is definitely much greater than that of 2470, which is what you said will be more blurry (at the same aperture);

Secondly, what you said is that it's not enough to produce blur. The concept of 'more beautiful blur' is still a bit vague. Based on your analysis, you mean that the blur level of 2470 is not as high as that of 70200 at the same aperture, right? In fact, the degree of blur is one aspect, and the quality of blur is also a parameter! This is the so-called out-of-focus image quality. Of course, every lens will have the best imaging quality, but that is another matter. If you are very keen on a large depth of field, it is definitely easier to get a larger depth of field with the 70200 under sufficient light and conditions.

As for what you said about seeing a lot of telephoto cameras used in the field, I believe they are shooting people and news figures, so the requirements for image quality are not very high. But I believe that based on my experience, the imaging effect of 2470 will be much better than that of 70200, and the price will also be different.

(I am a Pentax player. Personal opinions are welcome!)