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Not well known in Europe, but in Japan: The fastest 8086 PC ever is a NEC PC-98DO+ (one of the later models of the PC-9801 series), build around 1990.
The PC has a NEC V33A CPU running at 16 MHz, which is something between a 8086 and a 80186, but not an AT compatible (or higher). It has an EGA graphics card, a YM2608 (OPNA) sound chip/card, and of course already using a HDD, too.

The design looks like the later EPSON PC clone design, but we know, NEC build their PCs a bit before EPSON did it, too.
Unfortunately the V33A CPU is *not* pin compatible with the standard 8086, instead, it has a separate address and data bus, but has the same instruction set as the NEC V30 (which is pin compatible with the 8086). May be it is possible to build a CPU adapter for it, but it's far too late to have still a high demand for this ;-)