This, as most posts condemning AZ around here, is distorted and/or wildly exaggerated.
1) Strikes at Italian airports do exist but are less frequent than people seem to think and even when they're striking they usually manage to get you and your baggage there in time. AEA statistics give Alitalia a better luggage connection % than KL, in my view that's a more reliable measure than some relative who was affected by an MXP strike.
2) Unless you're involved in irr ops, M80s is the only equipment you are going to find on the CPH run, and all of them come with nonconvertible F seating. Undoubtedly configurations will depend on the equipment. I sometimes fly the ERJ on BHX-MXP, and that's convertible...actually the only difference between C and Y is a curtain. But that certainly doesn't concern the OP!

The above, of course, are completely unrelated to Alitalia's longhaul product. But they're no less than the objective truth as regards some AZ-related aspects (and no, I don't work for them neither do I claim they're the world's best airline...but some people round here seem to think that discrediting the honest efforts of others is fun, and I'm happy to defend the AZ folks who have always done their best to help me and more often than not recognise Skyteam benefits more readily and with a better attitude than AF....)