There has been many times it’s proven quite a big real world difference. Last year I think most notably.
But I can tell you my iPhone 7 (intel) is usually hanging onto 1 bar inside the house whereas my SE used to perform much better inside and on the same carrier. I’ve never had as many dropouts as I have with this phone.
I’m hoping on improvements with the 11 (Pro) this year over the Xs but I might upgrade again next year just because of the modem
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My iPhone 7 with intel

Pretty sure I had almost full range when I did this test