The new 27″ Apple iMac (2019) is very fast. Thanks to its Intel hexacore processor (which can be upgraded to an 8-core Core i9), this new computer zooms past through jobs like numerical simulations on Mathematica. The iMac Pro is still faster and more powerful but this regular iMac is cheaper.
The display is very good, although touch screen functionality is unavailable. Colors look alive and bright.
This year’s model retains the old design but can be upgraded to use solid state drives (SSDs) and memory greater than 64 GB. You can buy more memory from Apple or from third-party sources like Other World Computing for a more reasonably priced upgrade kit.
To compare its performance with other Macs, try running Geekbench, a benchmark suite available for the Mac.