Samsung issued its Q2 2013 earnings guidance this week, pointing to record Galaxy S4 sales three months afters its release date and likely quarterly profits that could soar beyond the $8 billion mark.

The figures will be confirmed on July 26 but the supposed overhaul is not expected to steer away from the official results. According to a Reuters report, Samsung sold some 75 million units of smartphones from April to the end of June and more than 20 million of them bear the imprint Galaxy S4.

Essentially, the Asian tech giant is doing very well on the back of strong handset and component sales, Engadget said in a report as the company significantly improved its performance by roughly $3 billion in the past 12 months ending in June 2013.

From the $US6.4 billion of profit in the March quarter this year, the numbers will likely jump to $US8.33 billion, somewhat belying growing concerns that the company is faltering, particularly the momentum flashed by the GS4 shortly after its rousing debut.

The Galaxy S3 replacement chalked up more than 10 million buys around the world on its first four weeks of circulation and by June 30, the digits surged to over 20 million, easily making the GS4 as the fastest selling Samsung product ever.

By the end of the year, it is highly likely that the device will dethrone the GS3 as the bestselling Galaxy smartphone, surpassing the more than 40 million unit sales that the former Samsung flagship had registered by December 2012.

Analysts, according to Reuters, are upbeat that Samsung will only post more impressive figures in the remaining half of the year, particularly in Q4 2013, by which time the company has already rolled out its third-gen phablet, the Galaxy Note 3, plus a host of diversified mobile devices - from entry-level mobile phones to upscale tablet computers like the Galaxy Note 10.1 and the three new builds comprising the reinvigorated Galaxy Tab 3 lines.

The two latter product models compete directly with Apple's tablet menus, which later this year are set to be refreshed by the slimmed down iPad and the two versions of the iPad Mini 2 - one with a lower price tag and the other with Retina display panel.

Samsung's impressing showing, however, in the past three quarters still raised concerns from analysts and market watchers - all pointing to the recent declines in Samsung shares, with losses now standing at around $US34 billion.

Blamed largely for the alarming retreat is the alleged below par movement of the GS4, its supposed slides in the past two months prompted recent downgrade advisories from market analysts.

Yet according to Dongbu Asset Management analyst Sang-jin Jung, Samsung is doing just fine, noting that the company operates a diversified business, in which "when one business lags, it's got others outperforming and propping up the overall profit."

In an interview with Reuters, Mr Jung affirmed that sales for the GS4 are below expectations but he added that the Samsung smartphone saga is far from over, specifically its bitter rivalry with iPhone maker Apple.

"I think Samsung has some exciting stuff up its sleeves. The problem is no one is sure whether these products can really wow investors and consumers," the analyst said.

And positive reaction indeed for Samsung's upcoming releases in the next two quarters will determine whether the South Korean firm will keep the global smartphone crown by the end of 2013, denying anew Apple the honours it held beginning in 2008 and lost in December 2012.