New A7c owner, from a6000: dump all my APS-C lenses for FF?

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Pelbaya Junior Member • Posts: 37
New A7c owner, from a6000: dump all my APS-C lenses for FF?
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Hi all,

I recently moved to full frame. With that, I decided to purchase one of the compact 24mm f2.8 FE lens and I love it.

But I still have these lenses from my APS-C time:

Sony 16-55 f2.8 G

Sony 70-350 f4.5/6.3 G

Both are fantastic lenses, even with the A7c. As you know, the downside is my pictures are max 10mp, to compensate for the crop.

After having a few occasions to try the APS-C lenses, they seem to perform very well on the A7C.

I do not want to spend a fortune for expensive FF glass but I am willing to upgrade to benefit the full sensor. On the other hand, I am torn between risking to have a lower quality lens than what I am used to.

For example: the Sony 16-55 is brilliant. To keep the size smallish and stay within my budget, the only lenses I would consider are the Tamron or Sigma 28-70/75. I hear the sigma 24-70 is great but bulky and heavy.

On the telephoto side, the 70-350 is also excellent, giving me a fov equivalent of 105mm to 525mm. With my budget restrictions, I am considering the FE Sigma 100-400 (though I am concerned about the AF speed as I use it for photographing my son’s soccer games). 
My question:

Is it better to keep my quality APS-C glass with 10mp pictures ? 
Or will I see I big improvement in IQ with FF glass, even if it is lower quality.

I occasionally print on small 4x6, 5x7, sometimes 8x10.

Cheers!

Sony a6000 Sony a7
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