Well I usually look at these types of issues as we have family and friends that are disabled. I thought the Zaandam was a little tight in the passages, however I never noticed a problem, it just "felt" tight.
We have been on the Carnival Spirit. I noticed a gentleman in a wheel chair on our deck. The Stewart always had it clear. The Spirit also seems to be a bit larger. I did not have a tape.. it just "felt" bigger.