I do. The first-class coaches are almost never full. Indeed, I have often seen one person per first-class carriage. It needs to make at least two of them standard class.
I had also imagined that HS2 would be largely used by business travellers, so I was surprised to have the reply from HS2 stating that 70% of journeys on HS2 were expected to be for leisure purposes. I fully recognise the value of leisure travel to the economy, but where is the justification for an ultra-high-speed line, such as that which HS2 seems so determined to build, if 70% of those using it are doing so for leisure?