Sony's a7S is a full-frame (12.2 MP, 35mm) mirrorless digital camera with 4K video support, high-precision Fast Intelligent AF system, an ISO range of up to 409,600 and an XGA OLED EVF.

The a7S costs $2,498 (body only).

OLED type: 

XGA OLED microdisplay

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Cambridge Isotope Laboratories - Deutreated Reagents and High-Purity Gases for OLEDsCambridge Isotope Laboratories - Deutreated Reagents and High-Purity Gases for OLEDs