Hi Kaz,
Like Malhar, mine are still green, though there are hints of color change, possibly triggered by the cool nights we're now getting here (Overnight lows in the 40F's, with an occasional thirty something). I suspect it will be sour for some time, based on results from earlier years.
The only sweet citrus showing true orange are some of the LA Early, and they will still be sourish for a month or so more. The Changsha is also showing some color, though not as much, but they are sweeter, likely due to their low acid level.
I'll post pic's when the Xie Shan is fully orange-perhaps 3 weeks or so?-, along with my subjective impressions of the taste.
Jim