In a previous entry related to the topic of IFC4, BIM Corner mentioned briefly its history and presented the key upgrades from IFC2x3. If you have missed it, BIM Corner strongly encourage you to first go through the article here.
This entry presents a practical exercise BIM Corner has done on the Stavanger University Hospital project when they evaluated the possibility of moving towards IFC4. BIM Corner presents their assumptions, performed tests and results. In the end a conclusion and answer to the headline question.