Here's a few examples showing what can be done to pierce vegetation.
Key to getting sharp photos was selecting small image size, and zooming in all the way to 2400mm and autofocusing on the approximate distance, and then using manual zoom to fine-tune the focus on the bird itself.
All this was critical as this was either HK's second Booted or third Sykes's Warbler and images are essential to inform the identification so this was an important test for the RX10iii as a birding camera.
HKIA Magic Roundabout: Blue Whistling Thrush, Black-throated Thrush, Great Cormorant (181)
Hong Kong: House Sparrow, Ultramarine Flycatcher, Rufous-faced Warbler (467)
Greater China: Franklin's Gull, Buff-breasted Sandpiper (961)
Lifer: Rufescent Tiger Bittern