BIF with R5 and RF 100-500mm compared to A9II and FE 200-600 G

Steve W wrote:

Thank you for sharing your experience. I’ve also considered selling my full RF kit and buying the A1 like you have. For primes from 14 to 135 I am all Sony GM with the 20/1.8 and 90/2.8 Gs.

I wonder about this.  I've read through many reviews, watched many videos, and read any posts.  The R5 and A1 appear to be very close, but while a few have said the R5 AF is better, no one has said the A1 is overall better.  In fact, I've read A1 owners wish its AF worked more like the R5 without having to switch better eye detect modes depending on subject.  And others wished eye detect worked during video.  And still others say the A1 does not hold focus as well when the subject moves to the edge of the frame (A1 only has ~90% coverage and no AF points on the edges of the frame).  To be fair some have said the A1 AF is stickier and holds focus better (but others say with the right tweaks the R5 is as good or better).

I release the A1 has the stacked sensor, but overall the R5 seems to be as good and in some ways better than the A1 but a price $3000 lower.  I don't count IBIS on the R5 as being better though, they both look very good.

If it were me, I'd get the R5 a couple RF lenses and some tried and true EF lenses, the ones said to work as well as mirrorless lenses.   I think I'd have several thousand left over compared to the Sony. Maybe enough for a used 600/4.