Sony made a foray into the 5-inch smartphone space with the CES 2013 debut of its Xperia Z and Xperia ZL handsets. However, there's another mystery Sony handset "HuaShan" that's hogging the attention though it did a no-show at the world's biggest consumer electronics trade show.

The "HuaShan" or C5303 was spotted earlier in December 2012 and recent reports indicate that the phone will not be an entry-level handset but in the upper mid-range segment.

The HuaShan popped up on GLBenchmark and the site indicates that it will pack in a dual-core MSM8960T CPU that is clocked at 1.7GHz and Adreno 320 graphics.

"In the middle of December, we saw the Sony C530X (C5303), codenamed HuaShan, caught in the AnTuTu benchmark. It revealedits 1.7GHz processor clock speed, scoring 16,133 in the benchmark. Little else was known at that stage, but an outing on GLBenchmark reveals a few more details," noted an Xperiablog post.

The GLBenchmark results also reveal that the phone will have a 1280 x 720 pixels resolution display, on-screen touchscreen buttons, and run on Android 4.1.2 Jelly Bean OS.

Details regarding the C5303's screen size, battery, dimensions, RAM etc. are currently not known. However, experts opine that the HuaShan is likely a successor of the Xperia P and, therefore, could sport a 4-inch to 4.3-inch screen.

It was earlier anticipated that Sony's HuaShan phone will make its debut at the CES 2013; however, some tech pundits feel that an MWC 2013 unveiling is more likely.