All manufacturers will soon be or are already effected by the MDR or IVDR. It is probably worst for the ones that have products reclassified from class I to IIa (see previously posts) but majority of companies are class I companies. These are also effected quire hard depending on how the run their operations today.
The big news for class I manufacturers are that they must have a almost complete quality management system. no need for certification, but when the authorities inspect the companies you better meet ISO 13485 to avoid issues.
Already now the authorities have started to send out letters to manufacturers about the changes. One example is the Swedish authority sending out letters to the CEOs of class I registered products. Hopefully they read it carefully. The letter basically goes through article 10.9 in the regulation.