If you check new motherboards QVL then you can find Corsair 4000 CL19 kits with SpecTek or Samsung IC. If it's a new kit then I guess it's a higher chance on SpecTek or something else than a good Samsung. G.Skill is also starting to use lower binned Samsungs or higher binned Hynix in their new kits.
All depends on what you expect. If you want Samsung B then look for 3200 CL14-14-14 / 3600 CL16-16-16 / 4000 CL17-17-17 / anything 4266+.
New 3600 16-19-19 can be Hynix C/J or SpecTek. New 3600 CL18 can be everything but usually lower binned Samsung, Micron or Hynix. New 3600 CL16-18-18 can be Micron or Samsung but not guaranteed.
ADATA is often using Nanya. It also appears in Patriot memory. Overclocking results are similar to Hynix, SpecTek, lower binned Samsung or average Micron E.