The Glenair (10 and 15) sounds more natural -- and a bit more resolving -- than the DC8T. I imagine the Turnberry would be similar to the Glenair 10. All are very nice speakers for the money. The DC8T has a lot of power available down low, and is a fun listen.
The Kensington SE and Yorkminster SE, with their pepperpot tweeter & alnico magnets, are both significantly more detailed than the Glenairs. The Yorkminster is significantly more efficient and notably more extended (in bass) than the Kensington. The Kensington is at least the equal of the Yorkminster in midrange & treble, and (IMO) much better looking. At 93dB/Watts for the Kensington/Turnberry, you're just on the cusp of high efficiency -- 95dB is where it really starts.