No, but let me add an important nuance.
In the Reference re Supreme Court Act, it says that the composition of the court is part of its essential features, just like the appointment conditions. The court specifies that the appointment conditions are those codified by subsection 4(1) and sections 5 and 6 of the Supreme Court Act. That is where there may be an ambiguity, leading some to react with extreme caution by saying that the essential features of the court would be affected.