LG C3 and Sony A90J are both OLED TVs with 4K resolution and flat design. However, the LG C3 has OLED Evo (OLED EX) with Brightness Booster as its special feature, which enhances the brightness of the screen. On the other hand, the Sony A90J has XR Motion Clarity, which enhances the motion handling of the screen. In addition, the Sony A90J has Bravia Core, which is a streaming service exclusive to Sony TVs that provides high-quality content.