New iMac worth it for me?

I currently have the following iMac:

21.5”Mid 2011

Processor   2.5 GHz Intel Core i5

Memory   12 GB1333 MHz DDR3

Startup Disk   Macintosh HD

Graphics   AMD Radeon HD 6750M 512 MB

and am looking to buy:

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• 3.6GHz quad-core 8th-generation Intel Core i3 processor
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• 8GB DDR4 memory
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• Radeon Pro 555X with 2GB of GDDR5 memory
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• 256GB SSD storage
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With my limited tech knowledge, I am wondering if there will be a significant advantage for me. I know that I have maxed out on my OS upgrades for my model.