Different Cell Signal Strength - iPhone 4 Versus iPhone 5

I have an iPhone 5 and my wife has my old iPhone 4 and there is a big difference in the cell signal from Telus on the two phones. Is this common or is something wrong with my iPhone 5? The green screen below is the iPhone 5, the blue the iPhone 4, they were sitting side by side on a table when I took these two screen shots yesterday afternoon. Note the dots on the 4 compared to the 5:

Attached Images

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