Of course, with a full frame camera comes full frame lenses... I chose the above three based on my usage on my A6500.
Sony SEL28F20
One of my favorite lenses on the A6500 was the SEL20F28 - The 20mm pancake. Although this isn't a pancake lense by any means, it's the smallest and lightest of the 3 full frame lenses I've chosen, and with crop factor closely matches the pancake with a 1 stop faster advantage. I loved the pancake for it's minuscule size and it's perfect seat between 24mm and 35mm. The 28mm seems to fill those shoes great, while offering even better low light performance. Initial tests seem promising, but time will tell.Sony SEL55F18Z
The spiritual replacement to my Sigma 30mm. This lens manufactured in partnership with Zeiss is one of the best options for the Sony family, and isn't too much longer than my 45mm equivalent Sigma. Despite being 10mm longer than my previously most used lens, I've instantly gravitated to this as my default choice. It focuses fast and accurately, and in combination with the A7iii, it's perfectly balanced. I've been very impressed with both the sharpness it's produced and the auto focus performance, and will no doubt continue to enjoy this lens.
Sony SEL85F18
The portrait option. This was my first full frame lens and I owned it before moving to the A7iii. I was very impressed with it on the A6500 (the 127.5mm equivalent gave it a bit more reach) even though it was a bit limiting. I shot soccer with it on the A6500 which went great, offering fantastic auto-focus performance and killer sharpness. Not exactly it's intended use, but it did a killer job over 1100 frames on a single battery. Don't be fooled by the lack of G or G Master designation - This thing is a heavyweight and easily throws punches with the best of the Sony 85s for a bargain price.
The future likely holds G Master lenses (24-70GM and 70-200GM I'm looking at you!), but as of right now I'm pretty happy with my prime lineup. The 28 should make for a great landscape and street lens (I was shooting most of my landscapes on my pancake anyway), the 55 will make for a killer daily shooter, and the 85 should blow away any portrait needs for the time being.
My next travel destination is likely Iceland, which will probably necessitate lens rentals. I'm thinking of packing the 16-35 G Master along with my current kit, and my friend I'll be travelling with will be packing some full frame goodies as well. I'm fairly confident between us we'll be packing enough gear to cover everything!
More to come!