Hi John, I've never played a Hailun before, but I like what I am hearing. Chinese pianos are typically like fruit that have been harvested before they have had a chance to ripen. Here sounds like an exception. It seems that the tone and timbre have been voiced properly and the sound board is functioning properly by projecting those harmonics. However, quality of components and the cohesiveness of all the parts over time is suspect with Chinese pianos. "Tacky plastic keys" are just on the surface. I keep an open mind about pianos, but I am suspect about Chinese mass production when it applies to piano manufacturing. They typically don't hold up well mechanically compared to European pianos over time. Resale values tank after purchase, and there's no guarantee that the sound will improve over time. Nothing is untouchable: I've heard of Steinways not improving over time, and Fazioli soundboards delaminating after 10 years - a complete disaster! Just make sure you examine the piano in detail with a master technician before you buy - including close examination of the action on a table.
I love the sound of my B - I bought it from a Steinway technician who cherry picked it from the NYC factory. There was a time that I thought of trading my B for a D, but I couldn't find a D which had the quality of tone and timbre of my B (except for the lowest bass notes). I didn't want to relinquish my B in the event that I couldn't find an excellent D - then I'd be stuck without a piano. As it is these days, I don't have much time to play anymore, so I'll keep the B for now. While I am still young, I'll spend the money on sports cars, then I'll make the switch to a D much later.
For longevity and investment, I suggest getting a nice Steinway B, but the choice is yours...
You are not going to get a better sound in a 13ft x 11ft x 10ft room - almost too nice, are you sure it's not meters?
Ribbon mics excel on string instruments - actually Itzhak Perlman uses a Coles 4038 ribbon mic to get that beautiful, silky smooth, deep, rich tone on the brighter Strads. But here the Beyer M160 is giving you good tone, with a smoothed over timbre - slightly less high frequency capability in a mic. Unlike most ribbon mics which are figure 8 pattern, the Beyer M160 is hypercardiod and the soundstage is too narrow for the large sound field that the piano generates. However, the AKG 451 is capturing the magic better in this regard as it is a cardiod pattern, with a more open and wider sound stage than your M160.