Is there measurement that correlates with cohesive/pinpoint imaging?

I am currently using single-driver Omega alnico speakers which have the most coherent imagining that I've ever heard.  However, if I wanted to compare them with other speakers (including multi-way speakers with crossovers) in that regard, are there any specific measurements to account for?  Would measured delay between driver signals in a multi-way speaker be a useful proxy?
Time and what JA has to say about Vandersteen “imaging champs”....

Thanks for the helpful reply.  I just read JA's review of the Vandersteen Quatro Wood.  His measurements are interesting.

"Fig.5 shows the Vandersteen Quatro Wood CT's horizontal radiation pattern, normalized to the tweeter-axis response and plotted up to 45° to the speaker's sides rather than the usual 90°... The contour lines in this graph are impressively even, implying stable stereo imaging."   

"Like its predecessors, Vandersteen's Quatro Wood CT offers a true time-coincident output, due to the stepped-back sub-baffles for the upper-frequency drivers, the first-order crossover slopes, and the fact that all its drive-units are connected in positive acoustic polarity. Fig.9 shows the speaker's step response on the tweeter axis. The initial arrival is an almost textbook right-triangle shape, though the tweeter's output arrives slightly before that of the midrange unit. This confirms that the optimal axis will be 5° below the tweeter axis. Finally, the Quatro Wood CT's cumulative spectral-decay plot (fig.10) is impressively clean."


I do know that in the same room with the same equipment, my Omega single driver speakers had a much more coherent and precise image than my Klipsch Forte IIIs and a pair of Vienna Acoustics Mozarts that I compared a little.
@djones51   Thanks for the tips about these other speakers
I have the Dutch and Dutch 8c, I never really listened to single drivers at least since the 1970's when I didn't know that's what I had. The D& D are very coherent I guess because they do the crossover in DSP. 
And the really excellent designers use science and listening and a deep love of music to move the art forward- stereo is an illusion after all. There are some excellent recordings utilizing research and products coming out of work on head transfer function - Macy Gray and Amber Rubarth come to mind - both excellent and hyper frustrating at same time. I will post LP numbers if desired....