2 of these companies have been materially impacted in a pretty significant fashion.
If I were to rank the 3, I'd likely go
PZA, BPF and then SRV
Lets get to the worst first. SIR Corp has a horrendous balance sheet. It has a significant portion of lease and debt obligations due in the next year with very little assets to pay them. Revenue has collapsed year over year, falling over 55% and net income went from $33.7 million to a loss of $5.6 million YoY as well.
Pizza Pizza is more of a quick service restaurant, whereas Boston Pizza and SIR Royalty are more dine in experiences. In both these companies cases, lounge revenue has been impacted quite a bit.
Since the company reported earnings last, Boston Pizza reported a 28.7% drop in gross sales, and net income has been significantly impacted as well. However, Boston Pizza is in a much better position financially to weather this storm than SIR was (and still is).
Pizza Pizza is the best option out of these 3 by a country mile in my opinion. Boston Pizza will recover, as they are in a position financially where they can survive. And, the restaurant actually is a popular take out option for some. SIR Royalty though is in fairly rough shape.