The mobile version of 3DMark uses a demo known as 'Ice Storm' to stretch your GPU's legs to their respective limits, and is definitely rather impressive to watch. Testing on an Optimus G Pro with a Snapdragon 600 chipset, it's apparent that even the top-tier Adreno 320 GPU begins to struggle under the intense demands of Ice Storm, and not merely during wide-pan shots: intricate models, effects, and textures are used in the demo.
3DMark is widely respected in the PC benchmarking space for GPU comparisons, and a mobile version was something of an inevitability, given the increasing capability of smartphone and tablet hardware. That said, heavy-lifting benchmarks like this one (especially when set to 'Extreme' mode) make it apparent that said hardware still has a long way to go before it matches up to PC or even current-gen console capabilities.
You won't find any Android games out there that match this demo visually, so it's worth taking a look at if only to see what - one day - your phone will be capable of rendering smoothly. Make sure you're on Wi-Fi when you head to the Play Store to grab it, though: the download is 280MB.