The **LG C4** is more favourable for the PS5 than the **Sony KD-55X85L** for several reasons:

### 1. **Screen technology: OLED vs. LCD**
- **LG C4 (OLED)**: Provides deeper blacks and better contrast as each pixel shines individually. This ensures more vivid colours and details, especially in dark scenes.
- Sony KD-55X85L (LCD)**: Shows less deep blacks due to the limited contrast and black level display of LCDs.

### 2. **Input lag and response time**
- LG C4**: Has extremely low input lag and fast response times, which is an advantage in fast-paced games.
- **Sony KD-55X85L**: Is also responsive, but the values are usually slightly higher, which can be noticeable in fast-paced scenes.

### 3. **HDMI 2.1 support**
- LG C4**: Offers HDMI 2.1 on all ports with functions such as VRR (Variable Refresh Rate) and ALLM (Auto Low Latency Mode), which provides a responsive experience.
- Sony KD-55X85L**: Also features HDMI 2.1, but often only on two ports, offering less flexibility.

### 4. **HDR performance**
- LG C4**: Thanks to OLED, very good HDR display with high contrast and vivid colours, ideal for realistic details in games.
- **Sony KD-55X85L**: Can be bright, but without the depth and contrast of OLED.

### 5. **Gaming-specific features**
- **LG C4**: Has a Game Optimiser for quick access to gaming settings and supports G-Sync and FreeSync to avoid image tearing.
- **Sony KD-55X85L**: Has basic gaming settings, but fewer options and no G-Sync.

### 6 **Risk of burn-in with OLED**
- LG has technologies to minimise burn-in risks, but it can happen with long static images. However, the risk is low in typical use.

### Conclusion
The **LG C4** is more favourable to the PS5 due to better contrast levels, low input lag, comprehensive gaming features and OLED-typical picture quality. The **Sony KD-55X85L** is a solid TV, but the LG C4 offers a better overall gaming experience.