Regarding the interior, I could not agree more. Definitively IKEA type. The Germans are probably great IKEA fans because Hanses also have the same kind of interiors
But one thing is style, another is quality and if in what regards design the French and Italians are much better I am not so sure about quality. I have chartered recently a new Dufour 425 ( Dufours are the most expensive of all big production French boats and arguably the ones with better overall quality) and my wife and my daughter complained about the quality of the interior (not the design) and about the fragility. They were comparing it with the one from our old boat (a 2003 Bavaria) and they were not convinced by the Dufour quality.
Regarding handholds, have you saw the long steel bar that goes from one side of the galley to the other? And the support and handhold on the opposite side, on the back of the seat? They look solid and there are not many (if any) production boat that have a perfect place to clip your harness to fix you properly while you cook on the wrong tack. Of course this is the kind of thing you can only be sure inside the boat, I mean adequate handholds.
Regarding beam, this is a typical modern cruiser: It has 3.99m, about the same as the new jeanneau 409 and Dufour 405, only 8cm more than Oceanis 40 and less 4cm than the Hanse 400 and much less than a Pogo
Were you can find differences are in weight and Ballast/Displacement ratios. Typically the French boats are lighter and have a poorer Ball/Displ ratio.
The Jeanneau 409 weights 7450kg and has a B/D of 0.30; The Oceanis 40 weights 8260kg, B/D of 0.26; The Dufour 405, 8080kg, B/D 0.29; The Hanse 400, 8400kg, B/D 0.32 and the Bavaria weights 9000kg and has a B/D of 0.31.
All boats have similar standard drafts (from 2.03 to 2.1m) with the exception of the Oceanis that has only 1.9m. All boats have similar keels with bulbs.
This means that the GZ curves ( length of the arm) should not be very different (with the exception of the one from the Oceanis that has less beam and has a remarkably worst B/D and has less draft). It means also that the ones from the Bavaria and Hanse should be the better ones.
With a better GZ curve and more weight, the Hanse and the Bavaria will have an overall better stability and more capacity to carry sails (the righting moment is obtained multiplying the GZ in each point of heel by the boat displacement). To be fair, l had to say that the Hanse can be made in Epoxy (expensive option) and then its weight goes down to 7900kg giving it an even better overall stability.
All the boats have about the same sail area ( Jeanneau 78m2, Dufour80m2, Oceanis 78,4, Bavaria 81m2, with the exception of Hanse that carries more (86,4 m2). Some boats, like the Jeanneau or Bavaria (I don’t know about Dufour) when using a conventional rig (not a furler main) can have performance sails with more area. On the Jeanneau that area goes from 78 to 93m2, I believe that you will have a similar difference on Bavaria and probably Dufour (between a boat with a Furler main and a conventional rig with performance sails).
The French boats come only with four winches and I believe that in most cases you cannot mount two extra winches, so you cannot have German sheeting and control the main from the wheel, but you have a traveler.
All this would mean that Bavaria would be the slower boat? Yes with light winds (if the Geenaker for the Bavaria is not bigger than the ones of the other boats) because the boat is heavier and carries not much more sail than the other boats, but with medium winds it will probably be faster than all the French boats.
He can carry more sail and more power without the need to reef. In medium or strong winds the Bavaria (with good sails) should be a close match to the Hanse, and the Hanse is a fast boat. It should also be more seaworthy (Stability and equipment), than the French boats. With bad weather and waves, the extra power will also be very useful.
All boats are compromises, and the Bavaria chose to have a more conventional boat with a good stability and a huge choice of options. The Bavaria is also the less expensive but you better take into account the options you will want, because it is possible to have more 40% of the boat price in options and extras. That’s what you pay for premium quality (sails, cars, winches and so on). A well equipped a Bavaria can be a good boat, a boat that will not only sail well in weak or average winds, but you have to pay for it.