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Expensive gear is awesome, and if you want world class results you should should buy it and use it.
However your photos probably don't warrant it, and almost all good/great photos could have been taken with almost any camera, given more or less effort from the photographer.
Learning to use what you have properly will leave you feeling like an enlightened monk in a sea of gearfagging idiots.
>most sharp photos are taken with stopped down apertures in good light
>most lenses are sharp stopped down, even junk zooms
>most cameras have plenty of resolution and dynamic range for good light