I don't think there is a definitive 'enough/not enough' here - it's just incremental improvements, both between generations and between the regular and the Pro.
Take photos casually, mostly in good light, to share on social media? The 14 will be great. And really, so will most high-end smart phones in the last 4-5 years. Want the absolute best and are willing to pay for it? You can certainly get a bit more detail out of the Pro, and you have more flexibility with the telephoto. Not miracles, but there is a bit more there if you are want to pay for it.
Surely wait 8ish weeks for the iPhone 15 range to come out?
Yup, definitely makes sense to hang on at this point, if only to get a better deal on an older model.