I'll admit I'm biased as I own one of these kikuichi TKC. This is my first J Knife and I'm absolutely impressed with it. It takes an edge really well and holds it for a long time. I'm just a home cook also but I would say I have decent skills, especially after getting this knife and watching the videos. I really love the videos BTW. My prep time was literally cut in half. Pun intended.
You should be able to go a few months between sharpening easily. The steel in this knife is nothing like a German knife. I have some very good German knives that although are good and I can get them sharp, they just don't hold a candle to The TKC. It really is a night and day difference in feel and cutting ability. I was blown away when I started to use mine. It still amazes me when I use it. I'm going to do a review once I have the time and when I get a few more months of use out of it. I've only had it about 4 months and I only sharpened it twice, and only because I wanted to not because it really needed it.
Coming from a 8" German Chef knife, the 240 TKC felt long to me and kinda awkward but the more I use it the more I like the additional length. I would recommend the 210 for your wife.
It comes highly recommended by the experts here and I can see why. You can slice, dice, rock chop or whatever and it will handle it just fine. It won't be a stretch going from a German blade to this knife.
I think whatever you get her she will be blown away with the difference. If you do get the TKC I know she will be thrilled.
That's my 2 cents.