That's almost certainly the answer. Over-exposed colour neg film always has more saturation than if "correctly" exposed, and this is particularly obvious with Reala. Rated at the standard speed, or perhaps a 1/3 stop faster, it's pretty neutral; overexposed by even as little as 1/3 stop it becomes quite vibrant in terms of saturation. I had never really thought of it as particularly saturated using my EOS cameras, which typically were set up to produce saturated slides, and thus always tended to underexpose rather than overexpose. It's only when I started using it in 120 that the truth became really clear to me.

So, we've got out-of-date film, an Opton Tessar which if my experience with Rollei versions is anything to go by is likely to be a touch warm, and possible mild underexposure - sounds like you've found the culprits.

FTR, personally I always used Kodak Portra NC for weddings (about the only thing I ever used Kodak film for out of choice!), but I use Reala as a general-purpose colour neg film for 120 as it gives me that choice of colour balance, and also scans particularly well on my scanner.