The Helio X20 features a pair of Cortex-A72 cores running at 2.5GHz, four Cortex-A53 cores clocked at 2GHz, and four more Cortex-A53 cores with a clock speed of 1.4GHz. This is what MediaTek calls a "Tri-Cluster" build.
As for the Meizu MX6, it will have a screen of unknown size, with a 1080 x 1920 resolution. 3GB of RAM is inside (the Helio X20 doesn't support any more), along with 32GB of native storage. Android 6.0 is pre-installed with Meizu's Flyme UI running on top.
The Meizu MX6 will be launched later this year which means we could see another handset make it to the market first with the Helio X20 SoC inside. Right now though, it seems that the smart money is going with the MX6.
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source: AnTuTu via GadgetzArena