This question needs a bit more definition to be understood across the board. "Best" can have many definitions; the two most relevant to this question are "London best" and "Best work."
"Best work" is a gun of design, material, and workmanship when made that left off only extraordinary embelishment. "London best" added the stylistic cues of SLE, no thru lumps, and stocked to the fences. As far as I can tell, gunmaking shops were "run by" masters who could do/recognize best work, knew what they could do in-house and knew who to contract for out-work. Men capable of economical (getterdone on time and at going price) "best work" were well known within the trade. The system of in-work/out-work was well established.
So, one should not assume any brand name assures best work or excludes best work. With the possible exception of Boss, all brands at least dabbled in less than best work guns. On the other hand, one occasionally finds a best work gun with a brand name normally associated with much more pedestrian product. One needs to look, hopefull with guidance, at enough best guns to get an intuitive feel for what best work looks like.
So, my answer to the question is, "Yes!" But, they are fairly rare; really good ones, maybe half a notch off best, are far more common.
