I've always held the Gaveau (partly) responsible for my flat dynamics, and this maybe proves at last I was right.
Yes, that´s indeed a certain proof! If I would be you and would have the 7500 Euro or whatever you mentioned to need for to get this Grotrian, I would buy it. (But, of course, I´m not you and you are not me. ) I don´t know the mechanique, but from the sound it´s clearly the better instrument (and it´s a wonderful instrument at all, I personally am really a fan of Grotrian-Steinwegs, and this old restored one has truely something like personality!). On the other hand we don´t know, how your Gaveau sounds after the revision, may be it´s better than the Grotrian then.
I had a Kawai GS 60 before I bought my Grotrian. I became more and more unsatisfied with it, because the strings became so unpure (they could not be tuned properly anymore). So, I also would have had to recruit the strings. But just in that time my piano technician told me of that offer of the old lady, who wanted to sell her Grotrian-Steinweg-grand, which I have now. So, I could sell my old Kawai and had to pay 3000 Euro in addition to what I got for my Kawai for to buy my Grotrian-Steinweg from that old lady. And I´m totally happy with it. (With my Grotrian, not with the old lady. ) It´s a marvellous instrument, very similar to a Steinway. The difference between a modern Steinway and a Grotrian-Steinweg is, that the tone of the Grotrian doesn´t sound as noble, but for this the Grotrian has a more sensitive and natural touch and sound. It´s nearer to the sound of the grand-pianos of 19th century, but the possibilities of differenciation of tone are the best of the world IMO (better than on some Steinways, which I have played).
Though the camera should more pan to the left where most of the action is.
Yes, that´s a mistake I often make still, too, but on the other hand it´s also nice to have the whole keyboard in the picture (I´m always afraid to cut something off, because the perspective could become to narrow when paning more to the left).
Camera drives me crazy ... after not even an hour of recording my SD card will be full and the battery empty. And I get no indication of either, it just switches off and deletes whatever track it was recording. This makes video recording a bit precarious.
Don´t you have an electricity cable for your camera? I never do record at home with the battery, though I have one, which is for 2 1/2 hours. But it´s much more comfortable to use directly the electrity cable, so you don´t have to care about changing the batteries. I have the impression, that your camera makes sharper pictures than my one somehow. I wonder what could be the reason.