drawElements just published a market analysis about the quality of the OpenGL ES 2.0/3.0 support among GPUs for mobile devices. This study includes the following GPUs:
From among the different GPU vendors, ARM and Qualcomm demonstrate the highest functional quality with their newest GPUs, the Mali-T604T and Adreno 320. They are closely followed by Imagination’s PowerVR GPUs. Nvidia’s new Tegra 4 comes in fourth, partly because of the lack of vertex shader texture support. Broadcom’s VideoCore IV delivers the lowest functional quality among the devices that were tested. It should be noted here that the number of tests passed by VideoCore devices also includes a number of tests that produced a warning in dEQP, indicating technically correct but possibly unexpected behavior.
The complete market analysis is available HERE (21-page PDF).