I was on CPU benchmark for another thread where I was hunting for some comparisons between an equivalent priced Dell AIO against the new iMac: https://www.cpubenchmark.net/compare/Apple-M1-8-Core-3200-MHz-vs-Intel-i7-1165G7/4104vs3814
The CPU is from last year around the same time as the M1 launch. That's comparing against an i7 with similar TDP, a lower base clock but higher boost clock and an equivalent amount of performance cores. It comes from a comparable priced equivalent product (a Dell Inspiron 27" AIO) currently listed for sale. The M1 appears to be beating it on their overall score and their single threaded execution score.
My read is that this means it's doing better than the Core i7 released around the same time.
Thats true, but we need to compare against the latest Rocket Lake processors which were announced in March 2021, after all you are not spending your money back in November last year. If you were to buy a computer now, your choices would be a 24” iMac or a Dell XPS featuring the latest Intel chip.
And as far as single-threaded performance goes, Intel had a very good update, the latest 11th generation desktop chips now score about 1600 on single-threaded Geekbench 5, compared to 1250 a year or so ago. Which is probably why they have released chips with a couple of cores less. In multithreaded mode the latest i5 scores about between 7200 and 8200, the i7 between 9000 and 11000, the i9 between 8500 and 11500. The M1 consistently scores about 1700 single threaded, 7700 multi-threaded.
But honestly, for most tasks that’s already very fast. My dad bought a new PC from HP a couple of years ago with a Ryzen processor which scores about 850 single threaded and 2700 multi threaded, and it’s fine for everything he does and he expects it to last him a good 8 years.
The thing is, Apple has not been very good at keeping machines up to date the last few years. Some Intel macs were still featuring 8th generation processors, and so comparing performance against what has come before is going to favour the new M1 chips heavily. A lot of YouTubers are also playing that game, comparing against whatever machine they have on hand.
Bottom line, you’re buying the whole package, design, great screen, peripherals, processor and macOS. I still like the iMac, it’s a great computer and I suspect it will be fast enough for my needs, although I may have to hold out for the 30” version.