Hi John
This is probably way too late to influence/inform your decision, but I have exactly the experience you were asking about!
When my 4 litre XJ6 Sport finally became TOO costly to maintain, I bought a Lexus GS450h 3.5 litre hybrid. I ran that for about 3 or 4 years until suddenly the hybrid battery failed!! Luckily my local Lexus dealer bought it back as a trade in against a newer “approved used” model. Needless to say, I was very wary of buying back into motoring on a battery again, so I insisted it must NOT be the hybrid version, just pure petrol! So I got a 2013 GS250 F Sport (2.5 litre normally aspirated).
On interior design, presentation, gadgets and overall comfort within the vehicle, I think the Lexus products are on a par with Jaguars of the same age.
On day-to-day reliability (despite my disaster with the first hybrid battery), the average running costs of the Lexus knocked Jaguar into a cocked hat very easily!!
On driving experience and performance, Jaguar beats Lexus hands down.
The hybrid GS450h was quite quick, but the weight of the battery compromised the handling somewhat and didn’t leave much room in the boot. Also the noise of the E-CVT gearbox took some getting used to. The GS250 was NOT an E-CVT gearbox, it was an automatic, but the acceleration from the 2.5 V6 was noticeably lacking when compared to either of the previous cars, though the handling was an improvement on the hybrid.
I loved my GS250, it was a lovely, comfortable reliable car, but I couldn’t forgive its lack of grunt away from the lights or getting on to busy roundabouts ☹️ So I traded it in last summer and bought a 5 litre V8 Jag XJ which was 2 years older but had half the miles on the clock AND it has that V8 sound which is a grin factor all of its own 😁
In the end, for me, it was a purely emotional decision; I feel happier and have more fun driving a Jag than I did in the Lexus. Technically wonderful but lacking in vavavoom!
The newer Lexus, which replaced the GS, is the ES and while it gets plaudits for design and style etc., appears to be just as lack lustre in the “seat of the pants”.
I hope that’s helpful to someone??
Cheers
Si