By V. Phani Kumar, MarketWatch

HONG KONG (MarketWatch) -- Japanese shares soared Wednesday on the back of a weaker yen and strengthening expectations for earnings growth, sending the benchmark Nikkei Stock Average above the 15,000-point level for the first time in more than five years.

Performance in the other regional markets was mixed, with Hong Kong and Taipei shares also rising after another record finish for key U.S. equity benchmarks. But equities in Shanghai and Sydney came under pressure amid lingering concerns about China's economic growth.

"Broadly speaking, the bulls remain dominant in an equity market environment of easy money, corporate profits and brighter economic data from the U.S.," said Niall King, an analyst at CMC Markets in Sydney.

"However, an overnight dip in commodity prices on the back of Chinese growth fears has immediately been felt by the local market, with the materials sector down sharply this morning," he added.

Australia's S&P/ASX 200 dropped 0.6%, China's Shanghai Composite eased 0.1% and South Korea's Kospi gave up 0.1%.

Meanwhile, Hong Kong's Hang Seng Index rose 0.5% after losing ground in the previous two sessions, and Taiwan's Taiex added 0.3%.

Japan's Nikkei was the region's best performer by far, climbing 1.8% to 15,020.50. The benchmark hasn't risen above 15,000 since January 2008.

Several exporters rallied as the U.S. dollar (USDJPY) was perched above the Yen102 level, with shares of Subaru-maker Fuji Heavy Industries Co. (FUJHY) gaining 3.7% and Renesas Electronics Corp. (RNECY) adding 1.4%.

Sony Corp. (SNE) soared 11.1% after billionaire hedge-fund manager Daniel Loeb called for a spin-off of the company's entertainment business.

Also delivering a superlative performance, Isuzu Motors Ltd. (ISUZY) jumped more than 20% after posting upbeat results for the year ended March 31.

Financials gained on hopes for strong earnings. Mizuho Financial Group Inc. (MFG) rose 1.3% after a Nikkei newspaper report said its profit for the year ended March 31 likely topped the lender's estimates, while Mitsubishi UFJ Financial Group Inc. (MTU) gained 3.1% after a separate Nikkei report the bank is expected to raise its dividend for the first time in five years.

In a statement, Mitsubishi UFJ said it hasn't made any decision on dividends.

On the downside, Sharp Corp. (SHCAY) tumbled 8.3% on news the company will replace top executives after posting the biggest loss in its history.

In Sydney, shares of Commonwealth Bank of Australia (CBAUY) climbed 0.6% after posting a 12% increase in third quarter profit.

But the broad market declined as recent dollar strength kept commodity prices and shares in the resource sector under pressure.

Shares of Newcrest Mining Ltd. (NCMGY) dropped 2.8% and BHP Billiton Ltd. (BHP) lost 2.1%.

Rio Tinto Ltd. (RIO) shares gave up 2.8% following a ratings downgrade by Barclays to equal weight from overweight.

Several property, insurance and banking stocks traded in Shanghai retreated to weigh on the broader market amid persistent fears about the health of the economy, and concerns that Beijing may not ease its policies to spur growth.

Bank of America Merrill Lynch cut its view on Chinese gross domestic product growth for 2013 to 7.6% from 8%. The brokerage wrote in a report that after "recalibrating base effects and taking into account sluggish external demand, we have changed our minds."

Shares of Poly Real Estate Group Co. shed 1%, Ping An Insurance Group Co. (PNGAY) gave up 1.4% and Industrial & Commercial Bank of China Ltd. (IDCBY) declined 0.5%.

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