Is there a way to check other companies benefits so I can show HR that ours isn't competitive?

What the title says - I'd like to find a way to compare my benefits with other companies out there or have the ability to see what companies like SunLife/CanadaLife are actually offering employers. We've had team members mention this to HR and they answer that our benefits are above the industry average (which maybe they are - but they certainly don't seem like it). Unfortunately, me just saying "hey $500 annually for a therapist is much less than previous jobs I've worked" isn't proof enough.

Does anyone have suggestions or tips on how to go about proving this to HR? At the very least I'd love to introduce the idea of tiered plans to them.