I not pouring Cold water, Obviously new iMac run faster due to new M chips etc BUT Beware of Lines suddenly appear on your iMac screen after using for one year ... I'm the victim not just me also others using M1 to M3 iMac. Of course some haven't encounter partly their M series iMac haven't use more than one year at least even so some never encounter this flaws is Just matter of time. Tech already mention due to Design flaws come Overheating easily on the display. Even replace the screen, the line problem will be back upon using for one year or so.
If You never do heavy works on the iMac , you can wait at least Apple do something on their iMac. Now a days guess cannot just see review come latest iMac mention how fast it was etc. Is wiser to check after one year see any iMac users feedback got any Major Flaws than decide. If the flaws is not Global issue than Ok but come the Line problems on M series iMac is already a Global issue come every M series Apple user...
Do note , I'm an Apple fan , happy user. Used to own few iMac before also iPhone and iPad but this Latest M series iMac obviously is disappointed compare with older iMac at least older iMac Don't have flaws which cause by Apple itself.
I not sure perhaps this is why seem there is a trend people start to use Mac Mini. Partly at least the display part u don't need to worry about " Over heating " You can just swap with another monitor. Or some maybe swap instead use iMac they go use Macbook Pro. As if their macbook pro screen faulty , they just use an external monitor. At most just treat it as a desktop iMac.